What It Treats – Healing agent which treats ammonia burn, abrasions, cuts. Mild antiparasitic/antibacterial properties. Will possibly detoxify a fish that has been exposed to cyanide poisoning. Probably one of the best “first response” treatments for a sick fish.
How To Treat – Comes in both liquid and powder form, sometimes mixed in with another medication (e.g. Nitrofuracin Green Powder). So, follow the directions on the label. Generally used in a 30 minute bath at double dose, but you can also dose it directly into a quarantine tank. Aerate heavily.
Dosing instructions for using 2.303% Methylene Blue solution:
1) 30 min bath (preferred): 1 teaspoon (5 ml) per 5 gallons.
2) In a quarantine tank: 1 teaspoon (5 ml) per 10 gallons every other day for 10 days with water changes before each treatment.
Pros – Highly effective “first response” treatment with minimal risk to fish.
Cons/Side Effects – Methylene Blue can destroy nitrifying bacteria (i.e. your QT biofilter), and will stain plastic, silicone, clothing, your skin, etc.