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Your aquarium is a tranquil and beautiful part of your home's décor. But at one point or another, you may have to deal with some things that aren't so pleasant, like fish diseases in your aquarium. There are a few factors that can cause fish fungus and bacteria to form in your [fish aquarium](https://www.chewy.com/b/aquariums-starter-kits-1735), including poor water quality, a large amount of decomposing matter, or fish with preexisting infection or injury. No matter how it got to this point, treating what ails your fish needs to be addressed quickly with a quality [fish fungus treatment](https://www.chewy.com/b/fungus-bacteria-treatments-938). [Tetra Lifeguard All-in-One Bacterial and Fungus Treatment](https://www.chewy.com/tetra-lifeguard-all-in-one-bacterial/dp/125875) can be used to treat and prevent many of the diseases that can afflict fish including ick, mouth and fin rot, flukes and ulcers. It contains the powerful oxidizing action of HaloShield, which destroys microorganisms and can also be used as a preventative when adding new fish. Use [API Bettafix Natural Healing for Betta Fish](https://www.chewy.com/api-bettafix-antibacterial-antifungal/dp/121925) if your Betta fish are suffering from fish diseases such as ulcers, mouth fungus, or fin and tail rot, or if you see red ulcers, slimy patches or cottony growths. It's a natural antibacterial remedy made with healing Melaleuca (a variety of Tea Tree) to help heal wounds and repair tissue damage. It's important to remember that tanks with fish that have reoccurring fish diseases the require [fish parasite treatment](https://www.chewy.com/b/parasite-ick-treatments-939) so you need to be examined for tank hygiene, filtration and water quality. A healthy tank will rarely have fish fungus issues and you won't have to use a fish fungus treatment. To take tank cleaning a step further look into purchasing some [fish water care treatments](https://www.chewy.com/b/water-care-906) and be sure to have the right [fish tank filters](https://www.chewy.com/b/filters-925) in your aquarium. Keeping your fish's water clean is the first step to providing them with a great new home. Whether you need some new [fish food](https://www.chewy.com/b/food-treats-886), [fish tank accessories](https://www.chewy.com/b/decor-accessories-1737) or any other [fish supplies](https://www.chewy.com/b/fish-885) Chewy's [online pet store](https://www.chewy.com/) is where you can go for great deals today!

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Best Fish Health Products: Top Brands, Low Prices (Free Shipping) | Chewy

Use fish medicine according to the package directions. Many fish medications are administered by adding them to the fish's water, but you can also find topicals and medicated fish foods. You may need to isolate sick fish and/or remove your tank's carbon filter for best results. The medication you choose should have detailed instructions, but you may want to contact an experienced aquarist or aquatic veterinarian for expert guidance.

Fish do sometimes need antibiotics, particularly when they are suffering from common bacterial infections like Aeromonas or Pseudomonas. Talk to your vet about appropriate treatments whenever you suspect your fish are ill.

The most common medicines for fish include fish fungus and bacteria treatments, fish parasite and ick treatments, and fish antibiotics. Chewy carries a wide range of fish medications to treat ailments of all types, so you should have no trouble finding exactly the right treatments for your finned friends!

What are the most common medicines for fish?

Your aquarium is a tranquil and beautiful part of your home’s decór. But at one point or another, you may have to deal with some things that aren’t so pleasant, like fish diseases in your aquarium. There are a few factors that can cause fish fungus and bacteria to form in your aquarium, including poor water quality, a large amount of decomposing matter, or fish with preexisting infection or injury. No matter how it got to this point, treating what ails your fish needs to be addressed quickly with a quality fish fungus treatment. 
Tetra Lifeguard All-in-One Bacterial and Fungus Treatment can be used to treat and prevent many of the diseases that can afflict fish including ick, mouth and fin rot, flukes and ulcers. It contains the powerful oxidizing action of HaloShield, which destroys microorganisms and can also be used as a preventative when adding new fish. Use API Bettafix Natural Healing for Betta Fish if your Betta fish are suffering from fish diseases such as ulcers, mouth fungus, or fin and tail rot, or if you see red ulcers, slimy patches or cottony growths. It’s a natural antibacterial remedy made with healing Melaleuca (a variety of Tea Tree) to help heal wounds and repair tissue damage. 
It’s important to remember that tanks with fish that have reoccurring fish diseases need to be examined for tank hygiene, filtration and water quality. A healthy tank will rarely have fish fungus issues and you won’t have to use a fish fungus treatment. But when an infection does happen, you can find the best bacteria and fish fungus treatments here on Chewy.

Health & Wellness

True

Autoship & Save Eligible

Antibiotic

Fish Fungus & Bacteria Treatment

Fish Parasite & Ick Treatment

Medication

Vitamins

Water Conditioner

Product Type

Activ-Betta

Boyd

Fishbiotic

Fritz

Fritz Aquatics

Hikari

Kordon

Microbe-Lift

Midland Vet Services

Nature's Ocean

Tetra

Brand

Tropical Freshwater

Marine Fish

Goldfish

Cichlid

Betta

Bottom Feeder

Marine Invertebrate

Koi & Pond Fish

Fish Type

Freshwater

Saltwater

Pond

Aquarium Type

Anti-Fungal / Anti-Bacterial

Health Feature

[0,9.99]

[10,19.99]

[20,29.99]

[30,39.99]

[40,49.99]

[50,*]

Price

[4,5]

[3,5]

[2,5]

[1,5]

Customer Rating

Boyd Viatchem Marine Fish Multi-Vitamin, 16-oz jar

Fritz Slime Out Fish Treatment, 20 count

Microbe Lift Herbtana Salt & Freshwater Fish Treatment, 16-oz bottle

API Pond Melafix for Bacterial Infections in Fish + Pond Algaefix Algae Control Solution

Fish Medicine & Healthcare