Description
About Fish Mox 500mg
Fish Mox 500mg is an aquarium antibiotic containing Amoxicillin 500 mg in each capsule. This forte strength of the hobby’s most popular broad-spectrum aquarium antibiotic is the practical pick for larger aquariums, fish rooms, and keepers who want fewer capsules per dose.
Each factory-sealed bottle contains 100 capsules, giving fish keepers enough for a full treatment course — and for maintaining larger tanks, multiple aquariums, or a well-stocked fish-room first-aid kit. Suitable for use in both freshwater and saltwater systems (always confirm on the label).
Commonly used by fish keepers for
- Fin and tail rot (frayed, ragged, or receding fins)
- Mouth rot and body sores or ulcers
- Bacterial conditions linked to dropsy and red pest
- General gram-positive and some gram-negative bacterial infections
Key benefits
- Broad-spectrum aquarium antibiotic trusted by fish keepers for decades
- Easy water-column dosing — no injections or medicated food needed
- Works in freshwater and saltwater aquariums
- Factory-sealed, clearly labeled, genuine product
Product details
| Active ingredient | Amoxicillin |
|---|---|
| Strength | 500 mg |
| Form | Capsule |
| Count | 100 per bottle |
| For use in | Ornamental aquarium fish (freshwater & saltwater) |
| SKU | 50374324322587 |
How to use in your aquarium
- Remove activated carbon from your filter before treating — carbon absorbs medication and stops it working.
- Follow the label directions. The typical directions for this type of aquarium antibiotic are one capsule per 10 gallons of water, repeated every 24 hours.
- A partial water change (about 25%) between doses is recommended.
- Continue the full course as directed on the label (typically 5–10 days). Stopping early can let the problem return.
- When treatment is finished, do a water change and return fresh activated carbon to the filter to remove residual medication.
Tip: whenever possible, treat sick fish in a separate hospital/quarantine tank. It protects your main tank’s biological filter and lets you dose accurately.
Storage & handling
Store in a cool, dry place away from direct sunlight, with the cap tightly closed. Do not use past the expiration date printed on the bottle.
Important information
- For use in ornamental and aquarium fish only (or ornamental/aviary birds where stated). Not for human use.
- Not for use in animals intended for food.
- Always read and follow the directions printed on the product label.
- Keep out of reach of children and animals other than those being treated.
- If symptoms persist or worsen, consult a veterinarian experienced with fish or avian care.
Dosing a smaller aquarium? See Fish Mox 250mg — 100 capsules.
New to fish antibiotics? Start with our Fish Mox overview — strengths, uses and dosing basics on one page.
Frequently asked questions
What is Fish Mox 500mg used for?
Fish Mox 500mg is used by aquarium hobbyists to manage common bacterial conditions in ornamental fish, such as fin and tail rot, mouth rot and body sores or ulcers, bacterial conditions linked to dropsy and red pest. It contains Amoxicillin 500 mg per capsule.
How do I dose Fish Mox 500mg?
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, for the number of days stated on the label. Always follow the directions printed on your bottle.
Will treatment affect my biological filter or tank mates?
Antibiotics can disrupt the beneficial bacteria in your biological filter, so monitor ammonia and nitrite during and after treatment. Whenever possible, treat in a separate hospital tank. Remove activated carbon during treatment, and check the label before treating tanks with invertebrates or live plants.
What is the difference between Fish Mox 500mg and Fish Mox 250mg?
Both contain amoxicillin; the 500 mg capsules simply contain double the amount, so larger volumes of water can be dosed with fewer capsules. For smaller tanks, the 250 mg strength offers finer control. Follow each product’s own label.
Is this product for human use?
No. This product is sold strictly for use in ornamental fish kept in aquariums (or ornamental/aviary birds where stated). It is not for human use and not for animals intended for food.
How fast will my order ship?
Most orders are processed within 1–2 business days and arrive within 2–5 business days of shipping, with a tracking link emailed to you. Unopened, unused items in original packaging can be returned within 30 days of delivery — see Shipping & Returns.
Is Fish Mox 500mg the same as Fish Mox Forte?
Yes — “Fish Mox Forte” is the name hobbyists commonly use for the 500 mg strength of fish amoxicillin (sometimes written FishMox Forte). This listing contains amoxicillin 500 mg per capsule, 100 capsules per factory-sealed bottle — the same strength keepers look for when searching for the forte version. For standard home aquariums, the Fish Mox 250mg strength is usually the starting point.
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