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Methylene Blue

$13.99
$13.99
Sold out

  • Prevents fungal infections on fish eggs
  • Treats nitrite and cyanide poisoning in fish
  • Treats fungus and external protozoan parasites on fish

Methylene blue is commonly used by fish breeders to prevent and treat fungal infections on fish eggs, as well as treat fish with cyanide and nitrite poisoning. As a secondary use case, it can help treat superficial fungus and some external protozoan parasites on fish. The disease symptoms can include white tufts or strands on the body (fungus) and scratching on the tank bottom or objects (external parasites).

Royal Medicine Methylene Blue

Treat Egg Fungus

Adding methylene blue until the water is blue is a great way to keep fungus at bay. This won't prevent unfertilized eggs from going bad, but it can keep them from contaminating the good, viable eggs.

A Little Goes A Long Way

You only need a few drops for treating eggs, so a bottle of methylene blue will last for years. Use our catch cup with an air stone and some methylene blue to easily hatch corydoras catfish and other fish eggs.

small_meth_blue_catch_cup_corydoras_eggs
Aquarium Co-Op Breeding Supplies Aquarium Co-Op Unbreakable Catch Cup

Improve Your Hatch Rate

When hatching fish eggs, add an air stone in a container like our catch cup to increase oxygen flow in the water and prevent fungus from spreading to the fertilized eggs.

Customer Reviews

Based on 29 reviews
93%
(27)
7%
(2)
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C
Cameron (Sheridan, OR, US)
Good size bottle.

Hasn't leaked anywhere.... knock on wood.

E
Erick C. (Seattle, WA, US)
Great pricing even better product

Live behind this methylene blue. Even better when Cory and aquarium co op sells it!

S
Stacy C. (Russellville, KY, US)
Baby Angel’s

I noticed that my Angel fish had paired and spawned. This product was great they are still in wriggle stage but I estimate at least 200 babies hoping they continue to do well.

M
Matthew

Always quick and fast shipping

N
Nick (New Harbor, ME, US)
Works great

Works as intended and is helping me hatch Cory eggs!

S
Steele H. (Fond du Lac, WI, US)

Methylene Blue

S
Scott A. (Nampa, ID, US)
Methylene Blue for fry

Use a couple of drops of Methylene Blue in fry-rearing tanks. Works well. Never have any trouble with bacterial growth.

K
Kevin M. (Union Dale, PA, US)

No fungus, must have worked

S
Susan S.
Pretty sure this product is great

I have not used this product yet. I’m sure it’s great but I’m glad I have not had the opportunity to use it yet.

E
Emily R. (Frisco, TX, US)
Excellent for Preventing Fungus On Eggs

Relatively hard to find and works super well. Definitely recommend if you plan on breeding fish.

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