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Methylene Blue

$13.99
$13.99
Sold out

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  • 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
1

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.

2

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
3

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.

Royal Medicine Methylene Blue

Methylene Blue

$13.99
$13.99
Sold out

Customer Reviews

Based on 29 reviews
93%
(27)
7%
(2)
0%
(0)
0%
(0)
0%
(0)
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!

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Frequently Asked Questions

Shipping Policy

We process and ship out 98%+ of our shipments next business day. 

Live plants will ship using an appropriate service and typically arrive in 2 to 5 business days. Transit times do not include weekends, holidays, or weather delays. To avoid delays in the shipping network we recommend ordering live plants on Saturdays and Sundays for a Monday ship out.

Dry goods such as fish food, medication, filtration products, etc. can be ordered any day and will ship the next business day with an appropriate service. Typical shipping times are 1 to 7 business day transit time, depending on delivery location. 

Faster shipping options available at checkout for an additional charge.

Alaska and Hawaii have a $17.99 surcharge. We do not ship to Puerto Rico currently.

90 Day Return Policy

90 Day Return Policy

At Aquarium Co-Op, our goal is to have satisfied customers. We make every effort to inform our customers about how our products work, and what is 
to be expected. We recognize that sometimes a product may not completely
 meet the expectations of a customer. We take pride in having a 
no-hassle 90 day return policy. If you have purchased an item and are not 
satisfied, we will take it back.

To start a return, email our customer service team at shipping@aquariumcoop.com. Please note that the shipping cost of returning an item is not covered by Aquarium Co-Op.


Items being returned may be sent to:
Aquarium Co-Op
Shipping Team
800 Enterprise Dr.
Lexington, KY 40510 

Still Have Questions? Contact Us

Email: Shipping@aquariumcoop.com

Contact form: https://www.aquariumcoop.com/pages/contact-us

Visit our physical store:
Aquarium Co-Op
9661 Firdale Ave
Edmonds, Wa 98020

Send mail to our Warehouse:
Aquarium Co-Op Warehouse
800 Enterprise Drive
Lexington Ky, 40510