Fish Mox — Amoxicillin for Ornamental Fish
Fish Mox is the common name for amoxicillin capsules packaged for ornamental aquarium fish. Hobbyists use it to help manage common bacterial conditions such as fin and tail rot, mouth rot, and body sores. It comes in two strengths — 250 mg (standard) and 500 mg, often called Fish Mox Forte. Both are in stock at PetRemedyUSA and ship in 1–2 business days.
Buy Fish Mox — both strengths in stock
✓ Factory-sealed bottles · ✓ Guest checkout with credit card · ✓ Tracked US shipping · ✓ 30-day returns on eligible unopened items
Fish Mox 250 mg vs Fish Mox Forte 500 mg
| Fish Mox 250 mg | Fish Mox Forte 500 mg | |
|---|---|---|
| Active ingredient | Amoxicillin 250 mg per capsule | Amoxicillin 500 mg per capsule |
| Bottle size | 100 capsules | 100 capsules |
| Best suited to | Most home aquariums | Larger tanks & multi-tank fish rooms |
| Also searched as | fishmox, fish-mox | fish mox forte, fishmox forte |
| Listing | Fish Mox 250mg — 100 capsules | Fish Mox 500mg — 100 count |
What do hobbyists use Fish Mox for?
Amoxicillin is a broad-spectrum penicillin-class antibiotic. In ornamental fish keeping it is commonly used to help manage:
- Fin and tail rot (see our fin rot treatment guide)
- Mouth rot and cotton-mouth-like lesions
- Body sores, ulcers and red streaks
- Bacterial conditions associated with dropsy and red pest
How is Fish Mox dosed?
Typical label directions for this type of product are one capsule per 10 gallons of aquarium water every 24 hours, with a partial water change between doses, continued for the number of days stated on the label. Always follow the directions printed on your bottle. Whenever possible, treat in a separate hospital tank, remove activated carbon during treatment, and monitor ammonia and nitrite since antibiotics can affect your biological filter.
Frequently asked questions
Is “fishmox” the same thing as Fish Mox?
Yes. FishMox, fish-mox and Fish Mox are all spellings of the same type of product: amoxicillin capsules packaged for ornamental aquarium fish.
What is Fish Mox Forte?
“Forte” is the name commonly used for the 500 mg strength of fish amoxicillin. Our Fish Mox 500mg is that strength — 500 mg of amoxicillin per capsule, 100 capsules per bottle.
Do I need a prescription?
No prescription is required for ornamental-fish antibiotics. They are sold for aquarium use only.
Can I take Fish Mox myself?
No. Fish Mox is not for human use. It is packaged for ornamental fish only and is not manufactured, tested or labeled for people. If you need an antibiotic, see a licensed physician. It is also not for use in animals intended for food.
How fast does it ship?
Orders are processed in 1–2 business days and arrive in 2–5 days with tracking, anywhere in the US. See shipping & returns.
For ornamental & aquarium fish only. Not for human use. Not for use in animals intended for food. Packaging and branding may vary; you receive the exact medication, strength and count listed. Read and follow the printed label on your bottle.
Learn more in our fish care guides or browse all fish supplies.