Fish Doxy (Doxycycline) 100mg – 60 Capsules

Broad-Spectrum Fish Antibiotic for Targeted Bacterial Treatment

Fish Doxy 100mg delivers fast and reliable relief from bacterial infections affecting ornamental aquarium fish. Each tablet contains doxycycline hyclate—a powerful broad-spectrum antibiotic effective against both gram-positive and gram-negative pathogens. Designed for use in hospital tanks, this treatment is ideal for managing illnesses like fin rot, septicemia, tail rot, and columnaris in both freshwater and saltwater species.

Explore more fish medications in our Fish Antibiotics Collection.

Why Choose Fish Doxy 60 Capsules?

• Targeted Disease Control: Effectively fights bacterial infections including tail rot, body ulcers, and columnaris.
• Versatile Compatibility: Suitable for both saltwater and freshwater tanks—perfect for all types of ornamental fish.
• Fast Dissolving Tablets: Dissolves quickly for immediate absorption and systemic support.
• Minimizes Complications: Helps prevent the spread of secondary infections when used at first signs of illness.
• Compact & Effective: 60-count format is ideal for short-term or isolated treatments.

Learn more about our aquatic health standards on the About Us page.

How to Use Fish Doxy Capsules

• Preparation: Use in a quarantine or hospital tank with clean, dechlorinated water to isolate infected fish and ensure effective dosing.
• Dosage: Use 1 Capsule (100mg) per 10 gallons of water. Treat once daily for 5 to 10 days, depending on the infection's severity.
• Monitoring: Observe fish daily for behavioral changes. Perform partial water changes as needed between treatments.

Ingredients

Active Ingredient: Doxycycline Hyclate – 100mg per tablet. Inhibits protein synthesis in bacteria to stop infection at the source.

Other Ingredients: Pharmaceutical-grade excipients to enhance solubility and stability.

Possible Side Effects

• Temporary stress or reduced activity in fish
• Mild water discoloration
• Reduced appetite during treatment period

Warnings & Storage

• Do not use in tanks with invertebrates like shrimp or snails
• Do not combine with other medications unless directed by a veterinarian
• After treatment, perform a water change and use activated carbon to clear residual medication
• Store tablets in a cool, dry place away from sunlight and moisture
• Keep out of reach of children and pets

For shipping details, visit our Shipping Policy. For returns, please see our Refund Policy.

FAQs – Fish Doxy Doxycycline 100mg Capsules

• What does Fish Doxy treat?
  It treats bacterial infections such as fin rot, septicemia, tail rot, and columnaris. It is not effective against fungal, viral, or parasitic conditions.
• What are signs my fish needs antibiotics?
  Symptoms may include frayed fins, open sores, red streaks, discoloration, or erratic swimming. A vet or aquarist can confirm diagnosis.
• Can I use it in breeding tanks?
  Not recommended. Use a hospital tank instead to avoid stressing breeding fish or harming fry.
• Will it harm beneficial bacteria?
  Yes, it may affect the biofilter. Use a separate tank and add probiotics after treatment to restore bacterial balance.
• Can I mix with other treatments?
  No, unless advised by a professional. Unapproved combinations may reduce effectiveness or cause harm.
• How do I dispose of treated water?
  Dispose responsibly—dilute thoroughly and avoid dumping into natural water systems.
• How long do Fish Doxy tablets last in storage?
  Store in dry conditions away from light. Use before the expiration date on the package.
• Are there natural alternatives?
  Options include improving water quality, salt baths, or using probiotics. However, they may not match the efficacy of antibiotics in serious infections.
• How soon will I see improvement?
  Most fish show signs of recovery within 3–5 days—such as improved energy, better coloration, and healing of visible damage.
• What if the fish shows no progress?
  Discontinue treatment and consult a vet. It may be a resistant strain or another illness entirely.

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