Description
About Fish Zole 500mg
Fish Zole 500mg is an aquarium antibiotic containing Metronidazole 500 mg in each capsule. This forte strength of the hobby’s go-to metronidazole product suits larger aquariums and fish rooms, delivering double the per-capsule dose for anaerobic bacterial conditions and internal protozoan parasites such as hexamita.
Each factory-sealed bottle contains 60 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
- Hexamita infections, including hole-in-the-head and head-and-lateral-line erosion
- Internal protozoan parasites (often signaled by white stringy feces and appetite loss)
- Anaerobic bacterial infections
- Support during quarantine of new cichlids, discus, and other sensitive species
Key benefits
- The hobby standard for anaerobic bacteria and internal protozoan issues
- Well tolerated by sensitive species such as discus and other cichlids
- Can be dosed in the water column per label directions
- Factory-sealed, clearly labeled, genuine product
Product details
| Active ingredient | Metronidazole |
|---|---|
| Strength | 500 mg |
| Form | Capsule |
| Count | 60 per bottle |
| For use in | Ornamental aquarium fish (freshwater & saltwater) |
| SKU | 50077734437147 |
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 Zole 250mg — 60 capsules.
Frequently asked questions
What is Fish Zole 500mg used for?
Fish Zole 500mg is used by aquarium hobbyists to manage common bacterial conditions in ornamental fish, such as hexamita infections, including hole-in-the-head and head-and-lateral-line erosion, internal protozoan parasites, anaerobic bacterial infections. It contains Metronidazole 500 mg per capsule.
How do I dose Fish Zole 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.
Does Fish Zole treat parasites as well as bacteria?
Metronidazole is unusual among aquarium medications in that hobbyists use it for both anaerobic bacterial conditions and common internal protozoan parasites such as hexamita (associated with hole-in-the-head). That dual role is why many keepers consider it a quarantine-tank staple.
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.
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