Mollie white spots and piranha eye cloud

[Secret piranha owner]

Hello. I have 2 tanks that i use the same syphon for. All the sudden, both tanks are showing symptoms of disease. My 20 gallon mollie tank has 2 out of 10 fish with brand new white spots. In my 120 gal, My rhombeus Piranha’s left eye is half white. I have raised the water to 80 degrees and added salt. I cant use mechilite green on the piranha. I have read that is is lethal to them. Please help

Edited October 12, 2020 by Secret piranha owner

[Irene]

I'm sorry to hear that! Do you mind posting pictures of the white spots, as well as any water parameters you've measured, so that we can best help you? Also, here is an article on how to treat fish diseases with aquarium salt that you might find useful.