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Fish Flox (Fix Flox) Ciprofloxacin Capsules - 500 mg
Fix Flox at a Glance
For
Ornamental aquarium fish, plus non-food pet birds under veterinary guidance
Helps with
Fin and tail rot, ulcer-like sores, columnaris-type patches, red sores, and dropsy-like swelling
Form
Capsules, 500 mg each
Count sizes
30-count and 60-count bottles
Water type
Freshwater and saltwater
Made in
United States by Aqua Soma Labs
Fish Flox (Fix Flox) from Aqua Soma Labs is an antibacterial treatment for ornamental aquarium fish and non-food pet birds.
Each capsule contains 500 mg of ciprofloxacin, which works in treatment water to help manage suspected bacterial problems such as persistent fin and tail rot, columnaris-type patches, and ulcer-like sores when used as directed.
In the aquarium community, it is still commonly called Fish Flox, Fish Flox Forte, Aqua Cipro, fish cipro, or fish ciprofloxacin 500 mg.
Fix Flox from the Aqua Soma Labs Fix range is the current online replacement for discontinued Thomas Labs Fish Flox and Aqua-Cipro 500 mg products.
Aquarium keepers who previously used Fish Flox Forte or Aqua Cipro will recognize the same 500 mg capsule strength under updated Fix-brand labeling.
Fix Flox may be used to help manage persistent fin and tail rot, columnaris-type patches, ulcer-like sores, red sores, hemorrhagic septicemia, bacterial swim bladder concerns, and dropsy-like swelling.
These concerns may involve susceptible organisms such as Aeromonas, Pseudomonas, Vibrio, or Flavobacterium.
Reef keepers may also use ciprofloxacin in a separate hospital tank for suspected bacterial problems affecting anemones, including repeated deflation or tissue deterioration.
Fix Flox is available in 30-count and 60-count bottles with clearly printed expiration dates.
Choose the bottle size that fits your setup, whether maintaining one hospital tank, several community aquariums, or following an avian veterinarian's ciprofloxacin plan for a non-food pet bird.
Begin treatment when early signs of bacterial stress appear. Signs can differ between fish and birds, so the lists below separate the symptoms by species.
Fish-Specific Symptoms
Fin and tail rot with frayed or deteriorating fins
Ulcer-like sores or open wounds
Red sores or red streaking on the body
Dropsy-like swelling
Columnaris-type patches
Cloudy body patches that remain after water quality improves
Lethargy, appetite loss, or a rapid decline in activity
Bird Signs Under Veterinary Guidance
Fluffed-up feathers
Lethargy or reduced activity
Decreased appetite
Loose or changed droppings
Labored or difficult breathing
Any sudden change linked by a veterinarian to a bacterial problem
For birds, only use Fix Flox when an avian veterinarian has recommended ciprofloxacin for a specific condition and has established the appropriate amount, frequency, and duration.
Addressing a suspected bacterial problem early, together with stable water quality, good aeration, appropriate nutrition, and suitable housing, gives fish and birds a better opportunity to recover.
Same-day dispatch: Qualifying orders placed before 1:30 p.m. CT, Monday through Friday, ship from our United States warehouse through USPS or UPS.
Important Notice: This product is intended for aquarium and ornamental fish and non-food pet birds only. It is not for animals used for food.
Fish Flox vs Fix Flox: What Changed?
If you previously purchased Thomas Labs Fish Flox, Fish Flox Forte, or Aqua Cipro, here is what changed and what stayed the same.
Active ingredient
Same Ciprofloxacin Strength
Fix Flox contains the same 500 mg of ciprofloxacin per capsule associated with Fish Flox Forte and Aqua Cipro.
Manufacturer
New Manufacturer
Fix Flox is made in the United States by Aqua Soma Labs, replacing the discontinued Thomas Labs product line.
Capsule format
Same Capsule Form
The capsule can be opened and the powder dissolved in aquarium water, matching the format used by previous Fish Flox products.
Bottle sizes
30-Count and 60-Count Options
Choose a 30-count bottle for a smaller setup or occasional use, or a 60-count bottle for larger aquarium collections and longer treatment plans.
Benefits of Fix Flox for Fish & Birds
01
Wide Bacterial Coverage
Ciprofloxacin is generally described as active against many Gram-negative bacteria and certain Gram-positive organisms affecting ornamental fish.
02
Made in the United States
Fix Flox is manufactured in the United States by Aqua Soma Labs and supplied with clearly printed capsule strength and expiration information.
03
Helps Manage Stubborn Aquarium Problems
Aquarium keepers may choose Fix Flox for persistent fin rot, columnaris-type patches, bacterial gill irritation, ulcer-like sores, red streaking, septicemia, or bacterial dropsy-like swelling.
04
Consistent 500 mg Capsules
Each capsule contains a fixed 500 mg amount, making aquarium-volume calculations straightforward in a properly prepared hospital tank.
05
Easy to Prepare
Open the capsule, mix the powder in a clean cup of aquarium water, and distribute the prepared treatment evenly throughout the hospital tank.
06
Freshwater, Saltwater & Avian Use
Fix Flox may be used in properly prepared freshwater or marine treatment tanks. Bird use must occur only under avian veterinary supervision.
07
Ideal for Hospital Tanks and Quarantine
A separate treatment tank helps protect healthy tank mates, sensitive invertebrates, and the main aquarium's established biological filtration.
Usage Guidelines & Instructions
Directions for Use:
Always follow the directions printed on the current bottle. The steps below describe the usual aquarium-water method for ornamental fish.
1
Set Up a Separate Treatment Area
Move affected fish to a dedicated hospital or quarantine tank whenever possible.
A separate system makes treatment and observation easier and protects healthy tank mates and the main aquarium's biological filter.
2
Prepare and Add the Treatment
Open the capsule and dissolve the powder in a clean cup of aquarium water.
Distribute the prepared mixture evenly throughout the treatment tank.
Use one 500 mg capsule per 10 gallons or approximately 38 litres of treatment water.
3
Repeat and Maintain Water Quality
Repeat the treatment every 24 hours.
Perform a partial water change between treatments to keep ammonia and nitrite low.
Maintain stable temperature and strong aeration throughout the treatment period.
Continue once daily for 5 to 10 days according to the current label.
4
Use in Pet Birds Under Veterinary Guidance
Administer Fix Flox to non-food pet birds only under the direction of an avian veterinarian.
Do not use aquarium-water calculations to determine a bird's amount.
The veterinarian must establish the appropriate amount according to the bird's species, weight, condition, frequency, and treatment duration.
5
Complete the Full Treatment
Complete the recommended treatment period even when the fish begin to improve, unless a veterinarian advises otherwise.
Stopping too early may allow the bacterial problem to return.
If no improvement is seen after five days, discontinue treatment as directed on the label and consult an aquatic professional.
Fix Flox Amounts by Aquarium Size
Tank volume
Ciprofloxacin per use
500 mg capsules
10 gallons (38 L)
500 mg
1 capsule
20 gallons (76 L)
1,000 mg
2 capsules
30 gallons (114 L)
1,500 mg
3 capsules
40 gallons (151 L)
2,000 mg
4 capsules
55 gallons (208 L)
Approximately 2,750 mg
5 to 6 capsules
These figures follow the supplied label guideline of one 500 mg capsule per 10 gallons, approximately 50 mg per gallon. Dose according to the actual water volume of the treatment tank, not the number of fish. The current bottle label or your aquatic veterinarian's instructions take priority over this quick-reference chart.
What to Expect During Treatment
Days 1 to 2
Fish may hide or eat less, and the treatment water may look slightly cloudy. Maintain the treatment schedule and keep aeration strong.
Days 3 to 5
Look for sores and red patches that stop spreading, returning appetite, improved activity, and steadier breathing.
Days 5 to 10
Complete the recommended treatment period. Afterward, perform a partial water change and restore activated carbon if normally used.
If no improvement is seen by day five, or if the fish become worse, stop treatment and seek aquatic veterinary guidance.
What You Need for Treatment
Prepare these supplies before administering the first treatment:
A separate hospital or quarantine tank
A suitable aquarium heater
An air stone or established sponge filter
An ammonia and nitrite test kit
A suitable water conditioner or dechlorinator
A small net for gentle fish transfer
A clean cup for mixing the capsule contents
Pro Tip: Quarantine affected fish away from healthy tank mates. A small hospital tank with stable heat, strong aeration, and no substrate makes treatment and water changes easier. Remove activated carbon and switch off UV sterilization during treatment because both may reduce treatment availability in the water.
How Fix Flox Works
Each Fix Flox capsule contains 500 mg of ciprofloxacin.
Ciprofloxacin works by slowing or stopping the growth of certain susceptible bacteria when used as directed in treatment water for ornamental aquarium fish.
This may give affected fish a better opportunity to recover when the underlying condition is bacterial and susceptible to ciprofloxacin.
For non-food pet birds, ciprofloxacin should only be used under the direct guidance of an avian veterinarian.
The remainder of each capsule consists of the capsule shell and standard inactive ingredients that help keep the contents stable during storage and allow the powder to disperse when mixed with aquarium water.
Safety and Tank Notes
When used as directed, Fix Flox usually causes no problems in ornamental aquarium fish and non-food pet birds.
Incorrect amounts, unnecessarily prolonged use, or repeated antibacterial treatment may increase the risk of side effects and bacterial resistance.
Fish
Some fish may temporarily hide, eat less, appear mildly lethargic, or produce slightly cloudy treatment water.
If severe distress appears, including rapid gill movement, loss of balance, surface gasping, or remaining on the bottom, stop treatment, improve aeration, perform an appropriate water change, and seek aquatic veterinary advice.
Birds
Administer Fix Flox to birds only under avian veterinary direction.
Possible reactions may include reduced appetite, lethargy, or loose or changed droppings, especially when the amount is inappropriate or the bird is sensitive.
If the bird becomes fluffed up, inactive, has difficulty breathing, or stops eating, discontinue use and contact an avian veterinarian.
Invertebrates
Do not use Fix Flox in display tanks containing shrimp, snails, corals, or other sensitive invertebrates whenever a separate hospital tank is available.
Strong antibacterial treatment may harm sensitive species or disrupt the aquarium ecosystem.
Safe Use in Your System
Treat fish in a hospital or quarantine tank whenever possible.
Remove activated carbon and switch off UV sterilization during treatment.
Monitor ammonia, nitrite, temperature, and oxygen levels closely.
Do not combine Fix Flox with other treatments unless specifically advised by a qualified veterinarian.
Important Safety Warning
Fix Flox is intended for ornamental aquarium fish and non-food pet birds only. It is not intended for animals raised for food.
Store the capsules in their original container in a cool, dry location protected from direct sunlight, excessive heat, and moisture.
Keep the container tightly closed and out of reach of children and animals.
Always follow the directions printed on the current product label.
Shipping & Returns
Shipping Policy
Orders ship from our United States warehouse within one business day through USPS or UPS.
Qualifying orders placed before 1:30 p.m. CT, Monday through Friday, may ship the same business day.
Shipping rates and estimated delivery times are calculated at checkout.
Fix Flox contains ciprofloxacin and is used for certain suspected bacterial problems in ornamental aquarium fish, including persistent fin rot, columnaris-type patches, ulcer-like sores, red streaking, septicemia, and bacterial dropsy-like swelling.
Use in non-food pet birds should occur only under avian veterinary guidance.
What is the difference between Fish Flox and Fix Flox?
Fix Flox is the current Aqua Soma Labs replacement for discontinued Thomas Labs Fish Flox products. It provides the familiar 500 mg ciprofloxacin capsule strength with updated packaging and labeling.
Is Fix Flox a replacement for Aqua Cipro?
Fix Flox is presented as the updated Aqua Soma Labs ciprofloxacin product replacing older Aqua Cipro and Aqua-Cipro 500 mg products.
Is Fix Flox the same as Fish Flox Forte?
Fix Flox contains the same familiar 500 mg ciprofloxacin capsule strength associated with Fish Flox Forte.
What is inside Fix Flox?
Each Fix Flox capsule contains 500 mg of ciprofloxacin together with standard inactive ingredients and the capsule shell.
Is fish cipro the same as Fix Flox?
Fish cipro is a common search term for ciprofloxacin capsules labeled for ornamental aquarium fish. Fix Flox supplies ciprofloxacin in a 500 mg capsule.
Where can I buy ciprofloxacin for fish online?
Fix Flox 500 mg capsules can be ordered through this online store in 30-count or 60-count bottles and shipped according to the current store shipping policy.
How do I know if my fish might need ciprofloxacin?
Possible bacterial signs include persistent fin deterioration, ulcer-like sores, red patches, open wounds, columnaris-type areas, swelling, appetite loss, or rapid decline in activity.
Similar signs may result from poor water quality, parasites, fungal conditions, injury, or other causes. Seek professional assessment when the diagnosis is uncertain.
What size aquarium can one Fix Flox capsule treat?
The supplied aquarium guideline uses one 500 mg capsule per 10 gallons or approximately 38 litres of treatment water.
Can I use Fix Flox in my main community or reef tank?
A separate hospital or quarantine tank is strongly preferred. This protects healthy fish, invertebrates, corals, and the main aquarium's established biological filtration.
Does Fix Flox work in saltwater aquariums?
Fix Flox is presented for properly prepared freshwater and saltwater treatment tanks. A separate hospital system is especially important for marine aquariums containing corals or invertebrates.
How long should I treat with Fix Flox?
The supplied directions describe treatment every 24 hours for 5 to 10 days, with partial water changes between treatments.
Discontinue treatment and seek professional advice if no improvement is seen after five days.
How soon should I see improvement?
Improvement may become visible within three to five days through sores that stop spreading, returning appetite, steadier breathing, and increased activity.
Stop treatment and seek professional advice if the animal worsens or no improvement appears by day five.
Is Fix Flox safe for pet birds?
Fix Flox may be considered for non-food pet birds only under direct avian veterinary guidance. The veterinarian must determine the amount, administration method, frequency, and duration.
What bacteria does ciprofloxacin target in fish?
Ciprofloxacin is generally associated with activity against many Gram-negative bacteria and certain Gram-positive organisms. Aquarium concerns may involve susceptible Aeromonas, Pseudomonas, Vibrio, or Flavobacterium species.
Will Fix Flox harm beneficial aquarium bacteria?
Antibacterial treatment may disrupt beneficial biological filtration. Use a separate hospital tank whenever possible and monitor ammonia and nitrite closely.
Should I remove carbon or turn off UV during treatment?
Remove activated carbon and switch off UV sterilization during treatment because these systems may reduce the amount of treatment available in the water.
Can I combine Fix Flox with other fish treatments?
Do not combine Fix Flox with other antibacterial or aquarium treatments unless a qualified veterinarian specifically recommends the combination.
Can Fix Flox treat fungal, viral, or parasitic infections?
Fix Flox is an antibacterial product. It should not be expected to treat fungal, viral, or parasitic conditions unless a professional has identified a separate appropriate reason for its use.
How should I store and dispose of Fix Flox capsules?
Store capsules tightly closed in their original container in a cool, dry location protected from direct sunlight, excessive heat, and moisture.
Follow the current product label and applicable local requirements when disposing of unused capsules, treatment water, or filter media. Avoid releasing concentrated treatment into natural waterways.
More Fish & Bird Treatments
Fix Mox (Amoxicillin) 250/500 mg
A treatment for fin rot, dropsy, ulcers, and other bacterial concerns in ornamental fish. Available in 30-count and 100-count capsules.
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Transparency & Verification
How Product Information Is Verified
Who is responsible for this page: The store editorial team responsible for reviewing and maintaining product information.
Verification snapshot: This page is written from the current product label for this item and reviewed for accuracy and consistency before publishing.
How We Verify Product Information
Label-First Accuracy
Directions, treatment duration, storage information, and warnings are taken from the current product label.
Specification Validation
Key details such as the active ingredient, capsule strength, bottle counts, and manufacturer information are cross-checked against available product specifications.
Consistency Checks
Product content is reviewed for consistent strength, directions, safety information, and storage details throughout the page.
Updates
Pages are updated when product labels, packaging, bottle counts, manufacturer information, or directions change.
What we do not do: We do not invent product claims, and we do not add usage directions beyond what the current product label states for the intended use.
See something that does not match the product you received? Please contact us so the information can be reviewed and updated.
Educational use: This content is provided for general informational purposes only and is not a substitute for advice from a qualified veterinarian.
