Description
About Fish Dox 100mg
Fish Dox 100mg is an aquarium antibiotic containing Doxycycline 100 mg in each tablet. Doxycycline is a tetracycline-class, broad-spectrum antibiotic that fish keepers reach for when ornamental fish show red streaking, fin damage, or other common bacterial symptoms. This 60-tablet bottle is the value size for larger tanks and multi-tank fish rooms.
Each factory-sealed bottle contains 60 tablets, 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
- Septicemia (red streaks on the body or fins)
- Mouth rot and other common bacterial conditions
- Broad-spectrum coverage when the exact organism is unknown
Key benefits
- Tetracycline-class, broad-spectrum aquarium antibiotic
- A common choice when fish show red streaking or fin damage
- Works in freshwater and saltwater systems
- Factory-sealed, clearly labeled, genuine product
Product details
| Active ingredient | Doxycycline |
|---|---|
| Strength | 100 mg |
| Form | Tablet |
| Count | 60 per bottle |
| For use in | Ornamental aquarium fish (freshwater & saltwater) |
| SKU | 50077734699291 |
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 tablet 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.
Only treating one tank? See Fish Dox 100mg — 30 tablets.
Frequently asked questions
What is Fish Dox 100mg used for?
Fish Dox 100mg is used by aquarium hobbyists to manage common bacterial conditions in ornamental fish, such as fin and tail rot, septicemia, mouth rot and other common bacterial conditions. It contains Doxycycline 100 mg per tablet.
How do I dose Fish Dox 100mg?
Typical label directions for this type of product are one tablet 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.
Why did my water change color during treatment?
A slight tint to the aquarium water during doxycycline treatment is common and expected. A partial water change between doses and fresh activated carbon after the course finishes will clear it.
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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