Fix Doxy 100-mg (Doxycycline) Tablets Fish & Bird Antibiotics

Fix Doxy (Fish Doxy) Doxycycline Tablets - Fish & Bird Antibiotic 100 mg

Fix Doxy 100 mg (often just called Fix Doxy 100 or Fish Doxy in the hobby community and used as a replacement for older Fish Doxy and Bird Biotic products) is a trusted, broad-spectrum fish doxycycline 100 mg tablet in convenient tablet form for ornamental aquarium fish and non-food pet birds. As part of the Aqua Soma Labs Fix range of aquarium fish antibiotics, this fish and bird antibiotic helps manage common problems such as fin and tail rot, columnaris, septicemia and other Gram-positive and Gram-negative bacterial infections in freshwater and saltwater aquariums, while also supporting birds during respiratory infections or suspected chlamydiosis.

Doxycycline is a broad-spectrum tetracycline antibiotic that works by inhibiting bacterial protein synthesis, limiting the growth of susceptible bacteria in the gills, skin and respiratory tract.

Fix Doxy from Aqua Soma Labs supplies 100 mg doxycycline per tablet and comes in bottles of 30 tablets, giving hobbyists a reliable option when they need doxycycline for birds or a trusted fish doxycycline product.

Important Notice: This product is intended for aquarium and ornamental fish and pet birds only. It is not for human consumption or for animals used for food. We do not sell or recommend this product for human use.

Use Fix Doxy when you notice signs of bacterial stress such as clamped or frayed fins, red or cloudy patches on the body, labored breathing, nasal discharge or a persistent loss of appetite. Addressing potential bacterial issues early with doxycycline, together with good water quality and advice from an aquatic or avian professional when available, helps your fish and birds maintain a stable, healthy aquarium or aviary.

What Are the Benefits of Fix Doxy (Fish Doxy) for Fish & Birds?

• Broad-Spectrum Doxycycline
  Helps manage common bacterial problems such as fin and tail rot, columnaris, gill disease, septicemia and avian respiratory infections caused by susceptible Gram-positive and Gram-negative bacteria in both freshwater and saltwater aquariums.

• One Solution for Fish & Birds
  Formulated for ornamental aquarium fish and non-food pet birds, so you can rely on a single doxycycline product for both tanks and aviaries when appropriate.

• Tablet Form for Consistent Dosing
  Each tablet delivers a fixed 100 mg doxycycline dose, making it easier to follow dosing charts and repeat courses accurately across different tank volumes or bird sizes.

• Flexible Use in Tanks & Feed
  Tablets can be dissolved for use in hospital or quarantine tanks, or crushed and mixed with food or drinking water as directed, giving you options when dosing sensitive fish or birds.

• Familiar Fish Doxy / Bird Biotic Strength
  Provides a familiar 100 mg doxycycline strength that many hobbyists know from earlier Fish Doxy and Bird Biotic style products, making the switch to Fix Doxy straightforward.

How to Use Fix Doxy (Fish Doxy) for Aquarium Fish & Birds

1. Prepare a Separate Treatment Area

   • For fish, set up a hospital or quarantine tank with clean, dechlorinated water so you can treat without disturbing the main display tank or its biofilter.
   • Remove activated carbon, resins and UV sterilizers during treatment, as they can strip doxycycline from the water.

2. Calculate and Give the Dose

   • Fish: Check the dosing instructions on your Fix Doxy bottle. Label directions for 100 mg tablets typically call for 1 tablet (100 mg) per 15 gallons of water, repeated every 24 hours for several days. Pre-dissolve the tablet in a small cup of tank water, then add it evenly around the treatment tank.
   • Birds: For companion birds, dosing is based on body weight or medicated drinking-water volume. Crush the tablet and mix with soft food or a measured amount of drinking water only as directed on the packaging or by an avian veterinarian, making sure the bird receives the full intended dose.

3. Monitor Progress and Water Quality

   • Watch appetite, breathing, activity level and fin or feather condition every day. If symptoms worsen or no improvement is seen after several days, contact a veterinarian.
   • For fish, perform partial water changes between doses if water quality declines, then re-dose for the new water volume. Continue treatment for the full course recommended on the label, usually around 5–10 days, unless your vet advises otherwise, and never exceed label directions.

What Makes Fix Doxy (Fish Doxy) 100 mg Effective?

• Active ingredient: Doxycycline Hyclate 100 mg per tablet
  Doxycycline hyclate is a broad-spectrum tetracycline antibiotic that interferes with bacterial protein synthesis. It helps control susceptible Gram-positive and Gram-negative bacteria linked with fin and tail rot, mouth rot, columnaris, gill disease, septicemia and avian respiratory infections.

• Water- and Feed-Friendly Tablet Base
  Tablets are formulated to disperse readily in aquarium water or to be crushed and mixed with soft food or drinking water for ornamental aquarium fish and non-food pet birds, helping the dose spread evenly through the treatment tank or flock.

Shipping & Returns

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Refund Policy: If there’s an issue with your order, you may be able to return or exchange items within 30 days according to our store guidelines. Before sending anything back, please review our refund policy carefully.

Fix Doxy (Fish Doxy) Doxycycline 100 mg – FAQs for Fish & Birds

What is Fix Doxy (Fish Doxy) used for?
Fix Doxy is a doxycycline hyclate 100 mg antibiotic for ornamental aquarium fish and non-food pet birds. It is used when bacterial problems such as fin and tail rot, columnaris, gill disease, septicemia or respiratory infections in birds are suspected and a veterinarian or experienced aquatic or avian keeper recommends a doxycycline-class product. It does not treat parasitic, viral or fungal conditions.

Is Fix Doxy the same as older Fish Doxy or Bird Biotic tablets?
Fix Doxy uses the same doxycycline hyclate 100 mg strength and similar dosing style as many hobbyists remember from Fish Doxy, Fishdox and Bird Biotic–type products. However, it is its own branded formula and you should always follow the directions printed on the Fix Doxy label.

How do I know if my fish or bird might need an antibiotic like Fix Doxy?
Signs of possible bacterial issues can include frayed or reddened fins, open sores, body patches, labored breathing, nasal discharge, fluffed-up feathers, or a sudden drop in appetite. These signs are not specific to one disease, so a veterinarian or experienced aquatic/avian professional should help confirm whether a doxycycline fish and bird antibiotic is appropriate.

How long should I treat with Fix Doxy 100 mg?
Most label directions for doxycycline 100 mg tablets call for a course of about 5–10 days, with doses given every 24 hours. Do not stop early just because symptoms look better, and never extend the course or change the dose beyond what the Fix Doxy label or your veterinarian advises.

Can I use Fix Doxy in my main display or community tank?
It is usually better to treat in a hospital or quarantine tank. Like other broad-spectrum aquarium antibiotics, Fix Doxy can affect beneficial biofilter bacteria in a community tank. Treating separately helps protect your main system and makes it easier to monitor sick fish.

Will Fix Doxy harm my aquarium’s biofilter?
Any strong antibacterial treatment can impact nitrifying bacteria if used in the main tank. Using a separate treatment tank, monitoring ammonia and nitrite, and performing partial water changes as directed helps reduce the risk to your biofilter.

Can Fix Doxy be used for multiple bird species?
Doxycycline is commonly used in avian medicine, but dose and duration must match the bird’s species, size and condition. Use Fix Doxy for birds only under guidance from an avian veterinarian or according to clear directions from the product label for non-food pet birds.

What should I do if my fish or bird is not improving on Fix Doxy?
Stop treatment and contact a veterinarian. Lack of improvement can mean the problem is not bacterial, the bacteria are not susceptible to doxycycline, or the dose/treatment duration is not appropriate. Continuing an ineffective antibiotic can delay proper care.

How should I dispose of water or filter media that contained Fix Doxy?
After treatment, avoid dumping all medicated water at once into drains that may lead directly to natural ponds, streams or outdoor soil. Instead, carry out several partial water changes and dilute the used aquarium water with plenty of fresh tap water before disposal, following any local guidelines for aquarium water. Used filter media, carbon and disposable decorations that have been exposed to antibiotics should be sealed in a bag and placed in household trash rather than rinsed outdoors, to help protect nearby aquatic ecosystems.

Do I need a vet prescription to buy doxycycline for fish?
Many hobbyists search online for “doxycycline for fish without vet prescription”, but the actual rules depend on where you live. Products like Fix Doxy 100 mg are sold and labeled as aquarium fish antibiotics for ornamental fish and non-food pet birds, and in some regions they are available without a veterinary prescription. However, regulations can change, and serious or recurring infections should always be checked by an aquatic or avian veterinarian, who can confirm whether doxycycline is appropriate and how to use it safely.

Is Fix Doxy the same as the doxycycline humans take?
No. Even though Fix Doxy uses a doxycycline-class ingredient, it is manufactured, labeled and quality-controlled for fish and birds only. Human medicines must come from a healthcare professional and a licensed pharmacy. Never use Fix Doxy or any fish antibiotic for human treatment or for animals raised for food.

More Fish & Bird Antibiotics

Need another aquarium fish or pet bird antibiotic? Explore our Fish & Bird Antibiotics Collection for more Fix line and related treatments.

Looking for dosing and water-care advice? Visit the Fish & Bird Antibiotics Blog for practical guides and treatment tips.