Fish Doxy (Doxycycline) 100mg – 100 Capsules

Broad-Spectrum Fish Antibiotic for Bacterial Infections

Fish Doxy 100mg is a high-strength, broad-spectrum fish antibiotic formulated with doxycycline hyclate to combat common aquatic bacterial infections. Trusted by aquarists, it is effective against both gram-positive and gram-negative pathogens such as fin rot, tail rot, septicemia, and columnaris. This powerful formula works by inhibiting bacterial protein synthesis, promoting fast and complete recovery in ornamental fish.

Shop more aquatic treatments in our Fish Antibiotics Collection.

Why Choose Fish Doxy (100mg)?

• Comprehensive Coverage: Effective against a wide range of bacterial infections in both saltwater and freshwater aquariums.
• Quick Absorption: Capsules dissolve easily in water, allowing rapid uptake and healing.
• Ideal for Hospital Tanks: Great for use in quarantine setups to prevent cross-contamination.
• High Count for Multiple Treatments: 100-count format offers excellent value for larger tanks or repeat use.

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How to Use Fish Doxy Tablets

• Preparation: Use in a separate hospital tank with clean, dechlorinated water.
• Dosage: One 100mg Tablet per 10 gallons of water. Treat once daily for 5–10 days.
• Monitoring: Observe fish for changes in behavior or appetite. Perform partial water changes as needed between treatments.

Ingredients

Active Ingredient: Doxycycline Hyclate – 100mg per capsule. Inhibits protein synthesis to stop bacterial growth.

Inactive Ingredients: Pharmaceutical-grade excipients for capsule stability and dissolution.

Potential Side Effects

• Water may become slightly discolored during treatment
• Some fish may exhibit reduced appetite or stress
• Beneficial bacteria may be affected—use probiotics after treatment

Warnings & Storage

• Not for use in tanks with invertebrates such as shrimp or snails
• Do not mix with other medications unless directed by a vet
• After treatment, perform a water change and add activated carbon to remove medication residue
• Store capsules in a cool, dry place, out of sunlight and moisture
• Keep away from children and pets

Check our Shipping Policy for delivery options or our Refund Policy for returns.

FAQs – Fish Doxy Doxycycline 100mg

• What does Fish Doxy treat?
  It treats bacterial conditions such as fin rot, tail rot, columnaris, septicemia, and other infections caused by gram-positive and gram-negative bacteria.
• How can I tell if my fish needs Fish Doxy?
  Look for signs like frayed fins, red sores, unusual swimming patterns, lethargy, or open wounds. A vet can confirm diagnosis.
• Can I use Fish Doxy in breeding tanks?
  It’s not recommended, as it may stress fish and affect fry. Use in a hospital tank when possible.
• Does Fish Doxy impact beneficial bacteria?
  Yes, it may temporarily disturb the biofilter. Use a probiotic after treatment to restore microbial balance.
• Can I combine Fish Doxy with other meds?
  Only under veterinary supervision to avoid adverse reactions or reduced effectiveness.
• Does it work for non-bacterial diseases?
  No. It is not effective for parasitic, fungal, or viral infections. Use only when bacterial infections are confirmed or highly suspected.
• Is it suitable for all fish species?
  Yes, it’s safe for most ornamental freshwater and saltwater species when dosed correctly.
• How do I dispose of treated water?
  Do not dump it into natural water sources. Dilute thoroughly and dispose through municipal wastewater systems as permitted.
• What if my fish doesn’t improve?
  Discontinue treatment and consult a vet. Persistent symptoms may indicate resistance or a different illness.
• How long can I store Fish Doxy?
  Keep in a cool, dry place. Check the label for expiration and do not use past the printed date.

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