Malachite green, zinc free plus formalin 0.1 mg/L indefinite
0.1 mg/L OID Q3D for three treatments
fungi, some bacteria, Ich, Cryptocaryon, Oodinium Stains skin and fabrics. Is mutagenic, teraogenic. May be toxic to some species if overdosed. More toxic at higher temperatures. Formalin may disrupt biological filter. NOT ADVISED.
Malachite Green (zinc free) 100% Cures Ich, fungus, oodinium (velvet) mouth fungus, and prevents fungus on some eggs, most effective when used with salt. 28.4 grams make 1 gallon. Then use 1 drop per gallon.
It wont work if its a drop per gallon as thats not for a bath. A bath solution would be a lot more and just let the fish swim in it for a certain amount of time.
I know salt baths but not MG baths.