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Direct from Aqua Soma Labs with extended expiration dates.
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Ornamental aquarium fish for treatment-tank use only
Helps with
Fin and tail rot, mouth rot, skin ulcers, lesions, and other suspected bacterial problems
Form
Capsules containing dissolvable powder, 150 mg each
Count size
100-count bottle
Water type
Freshwater and saltwater
Made in
United States by Aqua Soma Labs
Fix Cin is an antibacterial treatment from Aqua Soma Labs for ornamental aquarium fish.
Each capsule contains 150 mg of clindamycin in a dissolvable powder. Aquarium keepers use it to help manage suspected bacterial problems such as fin and tail rot, mouth rot or cotton-mouth, skin ulcers, and slow-healing lesions.
The bottle contains 100 capsules, making it suitable for larger aquariums, multi-tank fish rooms, quarantine systems, or repeat treatment plans.
If you previously purchased Thomas Labs Fish Cin or Aqua-Cin, Fix Cin is the current replacement and provides clindamycin at the same 150 mg capsule strength.
Aquarium keepers may consider it when fish show fin and tail deterioration, mouth rot or cotton-mouth, bacterial dropsy-like symptoms, skin ulcers, recurring lesions, swim bladder concerns, or other suspected internal bacterial problems.
The capsule opens easily so the powder can be dissolved and distributed throughout a separate hospital or quarantine tank.
Use Fix Cin at the first signs of suspected bacterial stress, alongside clean water, stable temperature, strong aeration, and careful observation.
Fish Symptoms to Watch For
Clamped, frayed, or deteriorating fins
Fin and tail rot
Reddened areas or red streaking
Open sores, skin ulcers, or slow-healing lesions
Cottony-looking mouth damage or mouth rot
Listlessness or lethargy
Persistent appetite loss
Possible bacterial swim bladder or internal concerns
Treating early, together with clean water and strong aeration, helps protect the rest of the aquarium while the affected fish recovers.
If the main aquarium contains shrimp, snails, corals, or other sensitive invertebrates, move affected fish to a separate treatment tank.
Same-day dispatch: Qualifying orders placed before 1:30 p.m. CT, Monday through Friday, ship directly from our United States warehouse.
Important Notice: This product is intended for ornamental aquarium fish only. It is not intended for animals raised for food.
Fish Cin vs Fix Cin: What Changed?
If you previously purchased Thomas Labs Fish Cin or Aqua-Cin, here is what changed and what remains the same.
Active ingredient
Same Clindamycin Formula
Fix Cin contains clindamycin hydrochloride at 150 mg per capsule, matching the strength associated with Thomas Labs Fish Cin.
Manufacturer
New Manufacturer
Fix Cin is made in the United States by Aqua Soma Labs and replaces discontinued Thomas Labs Fish Cin and Aqua-Cin product lines.
Capsule format
Same Dissolvable Powder Form
The capsule opens so the clindamycin powder can be mixed into aquarium water in the same familiar treatment format.
Bottle size
100-Count Bottle
The 100-capsule supply is practical for larger treatment tanks, repeat treatment, quarantine systems, and multi-tank aquarium keepers.
Benefits of Fix Cin for Fish
01
Support for Common Bacterial Aquarium Problems
Fix Cin is commonly considered when bacterial stress appears through fin damage, mouth irritation, ulcers, lesions, or slow-healing wounds.
02
Freshwater and Saltwater Treatment
Aquarium keepers may use Fix Cin in properly prepared freshwater or saltwater hospital tanks according to the current label directions.
03
Helpful for Lesions and Wound-Type Concerns
Clindamycin may be considered when ornamental fish display redness, open sores, frayed fins, recurring lesions, or other suspected bacterial skin and soft-tissue problems.
04
Support for Internal Bacterial Concerns
Fix Cin may also be used in a treatment setup when appetite loss, low activity, digestive-type changes, or swim bladder symptoms may be connected with an internal bacterial problem.
05
Consistent 150 mg Capsules
Each capsule provides a fixed 150 mg amount of clindamycin, making aquarium-volume calculations easier and more repeatable.
06
100 Capsules for Larger Setups
The 100-count bottle is practical for larger aquariums, dedicated quarantine tanks, repeat treatment, and multi-tank fish rooms.
07
Hospital-Tank Friendly
Treatment in a separate hospital tank keeps the product where it is needed and reduces unnecessary exposure of the display aquarium and healthy tank mates.
Usage Guidelines & Instructions
1
Set Up a Separate Treatment Tank
Move affected fish to a dedicated hospital or quarantine tank whenever possible.
This makes treatment and observation easier while reducing unnecessary exposure of healthy tank mates.
Remove activated carbon and other chemical filtration media and switch off ultraviolet sterilization during treatment.
Increase aeration and maintain stable temperature.
2
Dose According to Aquarium Water Volume
Add one 150 mg capsule per 10 gallons or approximately 38 litres of treatment water.
Open the capsule and mix the powder in a small cup of aquarium water before adding it evenly throughout the treatment tank.
3
Repeat Every 24 Hours
Repeat the treatment once every 24 hours according to the current bottle label.
4
Perform Partial Water Changes
Perform a partial water change between treatments to support suitable water quality.
Monitor ammonia, nitrite, temperature, oxygen levels, and fish behavior throughout treatment.
5
Continue for 5 to 10 Days
Continue treatment for 5 to 10 days according to the severity of the suspected bacterial problem and the current product label.
Complete the recommended treatment period unless the fish develop severe distress or a qualified aquatic professional advises otherwise.
6
Stop if There Is No Improvement by Day Five
If no improvement appears within five days, discontinue use and reassess the likely cause.
Seek guidance from an aquatic veterinarian or fish-health professional, especially when symptoms worsen.
7
Clear the Harmless Yellow Tint After Treatment
Treatment water may develop a harmless yellow tint.
After treatment, change approximately 20% of the water and restore activated carbon until the water clears.
Fix Cin Amounts by Aquarium Size
Tank volume
Clindamycin per use
150 mg capsules
10 gallons (38 L)
150 mg
1 capsule
20 gallons (76 L)
300 mg
2 capsules
30 gallons (114 L)
450 mg
3 capsules
40 gallons (151 L)
600 mg
4 capsules
55 gallons (208 L)
Approximately 825 mg
5 to 6 capsules
These figures follow the supplied guideline of one 150 mg capsule per 10 gallons, approximately 15 mg per gallon. Dose according to the actual water volume of the treatment tank, not the number of fish. The current bottle label or instructions from an aquatic veterinarian take priority over this quick-reference chart.
What to Expect During Treatment
Days 1 to 2
Fish may hide or eat less, and the water may develop a harmless yellow tint. Maintain strong aeration and continue monitoring water quality.
Days 3 to 5
Look for sores and red areas that stop spreading, fins that begin holding their shape, returning appetite, and improved activity.
Days 5 to 10
Complete the recommended treatment period. Afterward, change approximately 20% of the water and restore activated carbon to help clear remaining treatment and discoloration.
If no improvement appears by day five, or if the fish become worse, discontinue treatment and seek aquatic veterinary guidance.
What You Need for 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 powder
Activated carbon for use after treatment
Pro Tip: Antibacterial treatments may affect biological filtration in some aquarium setups. Test ammonia and nitrite regularly, maintain strong aeration, and use a separate treatment tank whenever possible.
How Fix Cin Works
Each Fix Cin capsule contains 150 mg of clindamycin in a dissolvable powder.
Clindamycin works by slowing the growth of certain susceptible bacteria, giving affected ornamental fish a better opportunity to recover when treatment is combined with clean water and appropriate aquarium care.
Treatment success depends on the organism involved, the condition of the fish, and the stability of the treatment system.
Fix Cin is best considered when a bacterial problem is suspected rather than for fungal, parasitic, or viral conditions.
The capsule shell and standard inactive ingredients help hold the powder together, maintain stability during storage, and allow the contents to disperse when mixed into aquarium water.
The complete inactive ingredient breakdown may not be printed on the retail label.
Safety and Tank Notes
When used according to the current label, Fix Cin usually causes no problems in ornamental aquarium fish.
Incorrect amounts, combining multiple treatments, unnecessarily prolonged use, or repeat treatment without confirming the cause may increase the risk of unwanted reactions and antibacterial resistance.
Possible Fish Reactions
Fish may temporarily hide, appear mildly lethargic, eat less, or show temporary treatment-water discoloration.
Stop Treatment and Act Quickly If
Stop treatment if fish develop rapid gill movement, loss of balance, surface gasping, rolling, severe weakness, or remain on the bottom.
Increase aeration and perform an appropriate partial water change.
Support Water Quality
Maintain strong aeration, test ammonia and nitrite, and perform partial water changes as needed between treatments.
Filtration During Treatment
Remove activated carbon and other chemical filtration media and switch off UV sterilization during treatment.
Activated carbon may be restored after treatment to help clear discoloration and remaining product.
Invertebrates
If the display aquarium contains shrimp, snails, corals, or other sensitive invertebrates, move affected fish to a separate hospital tank.
Do Not Mix Treatments
Do not combine Fix Cin with other aquarium treatments unless a qualified professional specifically recommends the combination.
Important Warnings & Precautions
Aquarium use only: Fix Cin is intended for ornamental aquarium fish only.
Not for food fish: Do not use this product on animals raised for human consumption.
Storage: Keep capsules in their original, tightly closed container at 59โ86ยฐF or 15โ30ยฐC.
Store in a cool, dry location protected from moisture and direct sunlight.
Keep out of reach of children and animals.
Discontinue if no improvement: Stop treatment if no improvement appears after five days and reassess the likely cause.
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 Cin contains clindamycin and is intended for certain suspected bacterial problems in ornamental aquarium fish, including fin and tail rot, mouth rot, ulcers, lesions, open sores, and soft-tissue concerns.
What is the difference between Fish Cin and Fix Cin?
Fix Cin is the current Aqua Soma Labs replacement for discontinued Thomas Labs Fish Cin. It provides the same 150 mg clindamycin capsule strength in updated packaging.
Is Fix Cin a replacement for Aqua-Cin?
Fix Cin is presented as the current replacement for older Aqua-Cin clindamycin products used by aquarium keepers.
Where can I buy clindamycin for fish online?
Fix Cin 150 mg capsules can be ordered through this online store in a 100-count bottle and shipped according to the current store shipping policy.
What is the active ingredient in Fix Cin?
Each capsule contains 150 mg of clindamycin in a dissolvable powder.
How do I know if my fish might need clindamycin?
Possible bacterial signs include frayed fins, mouth damage, red streaking, open sores, ulcers, recurring lesions, appetite loss, and lethargy.
Similar symptoms may result from poor water quality, parasites, fungal conditions, injury, or other causes, so professional assessment is recommended when the diagnosis is uncertain.
Can Fix Cin treat fungal, parasitic, or viral problems?
Fix Cin is an antibacterial product. It should not be expected to treat fungal, parasitic, or viral conditions.
Can I use Fix Cin in my main community tank?
A separate hospital or quarantine tank is preferred. This protects healthy tank mates and reduces disruption to the display aquarium's biological filtration.
Is Fix Cin safe for saltwater fish or reef tanks?
Fix Cin may be used in a properly prepared saltwater hospital tank. Do not treat a reef display containing corals or sensitive invertebrates when a separate treatment system is available.
What is the recommended amount for fish?
The supplied guideline is one 150 mg capsule per 10 gallons or approximately 38 litres of treatment water.
How long should I treat with Fix Cin?
The supplied directions describe treatment every 24 hours for 5 to 10 days, with partial water changes between treatments.
What if my fish shows no improvement after five days?
Discontinue treatment and reassess the water quality and likely cause. Seek aquatic veterinary guidance, especially when symptoms become worse.
Will Fix Cin affect beneficial aquarium bacteria?
Antibacterial treatments may disturb biological filtration. Use a separate treatment tank and monitor ammonia and nitrite closely.
Can I mix Fix Cin with other treatments?
Do not combine Fix Cin with other aquarium treatments unless a qualified professional specifically recommends the combination.
Can I use Fix Cin as a preventive treatment?
Routine preventive use is not recommended. Treatment should be based on observed symptoms, the current bottle label, and professional guidance when the diagnosis is uncertain.
Is Fix Cin safe for betta fish and small aquariums?
Small treatment tanks require careful measurement. The supplied guideline is one 150 mg capsule per 10 gallons. Follow the current label or consult an aquatic professional rather than estimating.
Is Fix Cin the same as fish clindamycin?
Fish clindamycin is a common search term for clindamycin capsules labeled for ornamental aquarium fish. Fix Cin supplies clindamycin in a 150 mg capsule.
Is there a Fix Cin 300 mg version?
This Fix Cin product is supplied in a 150 mg capsule strength. A total amount of 300 mg would equal two 150 mg capsules according to the aquarium-volume guide.
How should I store and dispose of Fix Cin capsules?
Store capsules tightly closed in their original container at 59โ86ยฐF or 15โ30ยฐC in a cool, dry location protected from sunlight and moisture.
Follow the product label and applicable local requirements when disposing of unused capsules, treatment water, or filter media. Avoid releasing concentrated treatment into natural waterways.
How soon should I see improvement?
Improvement may become visible within three to five days through sores that stop spreading, improved fin condition, returning appetite, and increased activity.
Stop treatment and seek professional guidance if the fish become worse or no improvement appears by day five.
More Fish & Bird Treatments
Fix Mox (Amoxicillin) 250/500 mg
A treatment for fin rot, dropsy, ulcers, and other suspected bacterial concerns in ornamental fish.
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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
The active ingredient, capsule strength, bottle count, and manufacturer information are cross-checked against available product specifications.
Consistency Checks
Product content is reviewed for consistent directions, strength information, storage details, and safety language throughout the page.
Updates
Pages are updated when product labels, packaging, capsule counts, manufacturer details, 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 its 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.
