Expiration Date: Fix Mox 500 – EXP: 8/2027 Fix Mox 250 – EXP: 5/2027 Fix Flex 500 – EXP: 6/2027 Fix Flex 250 – EXP: 4/2026 Fix Doxy 100 - 30 – EXP: 2/2026 Fix Doxy 100 - 60 – EXP: 6/2026 Fix Flox 500 – EXP: 4/2027 Fix Pen 500 – EXP: 6/2026 Fix Sulfa 960 – EXP: 12/2028 Fix Zithro 250 – EXP: 6/2027 Fix Zole 500 – EXP: 2/2027 Fix Zole 250 – EXP: 12/2026 Fix Cin 150 – EXP: 8/2026 Reef Flux 200mg – EXP: 2/2027 Expiration Date: Fix Mox 500 – EXP: 8/2027 Fix Mox 250 – EXP: 5/2027 Fix Flex 500 – EXP: 6/2027 Fix Flex 250 – EXP: 4/2026 Fix Doxy 100 - 30 – EXP: 2/2026 Fix Doxy 100 - 60 – EXP: 6/2026 Fix Flox 500 – EXP: 4/2027 Fix Pen 500 – EXP: 6/2026 Fix Sulfa 960 – EXP: 12/2028 Fix Zithro 250 – EXP: 6/2027 Fix Zole 500 – EXP: 2/2027 Fix Zole 250 – EXP: 12/2026 Fix Cin 150 – EXP: 8/2026 Reef Flux 200mg – EXP: 2/2027
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Fish Doxy Doxycycline 100mg 30 Capsules Fish Antibiotics

$69.99 $79.99

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Wondering if your fish antibiotics are still safe and potent? Welcome to the official FishAntibiotics.us expiration date tracker—the most accurate and up-to-date source for ensuring you receive the freshest fish meds online.

Whether you're purchasing trusted Fish Mox (Amoxicillin), powerful Fish Zole (Metronidazole), or broad-spectrum solutions like Fish Flex (Cephalexin) or Fish Sulfa (Sulfamethoxazole/Trimethoprim), we keep you informed. Updated regularly, this guide helps you compare your product with the latest batch from FishAntibiotics.us.

We specialize in only the most reliable, pharmaceutical-grade aquarium antibiotics, including ciprofloxacin, azithromycin, clindamycin, and fluconazole. Buy with confidence, knowing your medication hasn’t passed its prime.


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Fish Doxy Doxycycline 100mg 30 Capsules

Fish Doxy (Doxycycline Capsules) is a highly effective broad-spectrum antibiotic designed specifically for fish, addressing bacterial infections caused by gram-positive and gram-negative bacteria. This trusted fish antibiotic helps treat a variety of common aquatic diseases, including fin rot, tail rot, columnaris, and septicemia.

Fish Doxy contains doxycycline hyclate, a potent antibacterial agent that works by inhibiting bacterial protein synthesis, ensuring a quick and thorough recovery for your aquatic companions. Perfect for both freshwater and saltwater environments, it is an essential addition to any aquarist's first aid kit.

What Are the Benefits of Fish Doxy Doxycycline Capsules?

  • Effective Against Common Fish Diseases: Targets gram-positive and gram-negative bacterial infections, offering relief from illnesses like fin rot and columnaris.
  • Versatile Usage: Suitable for both freshwater and saltwater fish species, making it a convenient choice for diverse aquariums.
  • Prevents Secondary Infections: Minimizes the risk of complications by tackling infections early.
  • User-Friendly: Easy-to-dose capsules dissolve quickly in water, ensuring rapid absorption by your fish.
  • Promotes Recovery: Encourages healing and improves overall fish health, reducing mortality rates in infected fish populations.

How to Use Fish Doxy Capsules for Fish?

  • Preparation: Dissolve the recommended dosage in a quarantine tank or hospital tank for better infection management. Use clean, dechlorinated water to prepare the treatment tank.
  • Dosage: Follow your veterinarian’s advice for precise dosing. General guideline: Use 1 tablet per 10 gallons of water. Treat for 5–10 days, depending on the severity of the infection.
  • Monitoring: Observe fish behavior and symptoms daily during treatment. Perform a partial water change between doses if necessary.

What Are the Ingredients in Fish Doxy Capsules?

Active Ingredient: Doxycycline Hyclate (100 mg per capsule) – A broad-spectrum antibiotic that inhibits bacterial growth.
Other Ingredients: Pharmaceutical-grade excipients to ensure tablet stability and dissolution.

Are There Any Side Effects of Fish Doxy?

  • Stress in fish.
  • Water discoloration.
  • Reduced appetite during treatment.

What Warnings Should You Be Aware of?

  • Do not use Fish Doxy in tanks with invertebrates (shrimp, snails, etc.) as it may harm them.
  • Avoid combining with other medications unless advised by a veterinarian.
  • After treatment, perform a water change and add activated carbon to remove residual medication.
  • Store the capsules in a cool, dry place, out of reach of children.

Shipping & Returns

Shipping Policy: We offer all types of shipping options (Ground, Express, Priority, International) depending on the urgency of the product requirements. View our shipping policy here.

Refund Policy: If you face any issue with our product and want to return it, read our refund policy here.

FAQs - Fish Doxy Doxycycline 100mg 30 Capsules for Fish

What is Fish Doxy Doxycycline Capsules used for?

Fish Doxy Doxycycline Capsules are used to treat bacterial infections in fish, such as fin rot, tail rot, columnaris, and septicemia. It targets gram-positive and gram-negative bacteria, helping restore the health of your fish in both freshwater and saltwater aquariums.

How do I know if my fish needs antibiotics like Fish Doxy?

Signs of bacterial infections include frayed fins, discoloration, open sores, unusual lethargy, or erratic swimming. A veterinarian or aquarist can confirm the need for antibiotics like Fish Doxy based on symptoms.

Can Fish Doxy be used to treat all types of fish diseases?

Fish Doxy is effective for bacterial infections only. It cannot treat parasitic, viral, or fungal diseases. Use it specifically when bacterial infections are diagnosed or strongly suspected.

Will Fish Doxy harm beneficial bacteria in my aquarium?

Yes, Fish Doxy can disrupt beneficial bacteria colonies in a community tank. This is why it’s recommended to use a separate hospital tank for treatment to protect your aquarium's ecosystem.

Is it safe to combine Fish Doxy with other fish medications?

Combining Fish Doxy with other medications may lead to interactions that reduce effectiveness or cause harm. Always consult a veterinarian before mixing treatments.

How should I dispose of water containing Fish Doxy after treatment?

Dispose of treated water responsibly by diluting it and avoiding direct release into natural water sources. This prevents antibiotic residues from harming aquatic ecosystems.

Can Fish Doxy be used for fish breeding tanks?

It’s not recommended to use Fish Doxy in breeding tanks unless necessary, as it may stress fish and impact fry survival rates. Treat breeding fish in a separate hospital tank if needed.

How long can I store Fish Doxy Capsules?

Fish Doxy Capsules should be stored in a cool, dry place away from light and moisture. Check the expiration date on the packaging, and do not use capsules past that date.

Are there natural alternatives to antibiotics like Fish Doxy for fish?

Natural alternatives include improving water quality, adding salt (for certain species), or using probiotics to boost fish immunity. However, these may not be as effective for severe bacterial infections as antibiotics like Fish Doxy.

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Fish Doxy 100mg – Doxycycline Capsules for Aquarium FishFish Doxy Fish Antibiotics – 100mg for Fin Rot & ColumnarisFish Doxycycline 30 Capsules – Fish Infection TreatmentFish Doxy 100mg  Doxycycline 30 Capsules Key FeaturesFish Doxy 100mg Doxycycline 30 Capsules Directions to Use

Customer Reviews

Based on 16 reviews
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K
KyRee Jones

Great product and timing

T
Tyler Robinson
Fraudulent seller

Ordered back to back same order . Order 12243 and 12244 . Contacted seller multiple times about 1 order being filled but not the other no response . Requested a refund for order 12244 I did not receive and seller copied and pasted tracking number for order 12243 or order 12244 order to avoid refund

K
Karen Wright
Great service

quick service and great communication

V
Vicki Mcpherson
Exactly item I ordered.

Easy and clear product information.
Didn't have to search for product. It came up on first page. Fast delivery! Thank you!

L
Larry Hammond

Worked well