Disease aquaponics

[Panyo]

Hi all I'm new to aqauponics buy my system is running well.. I have got some fish in the bottom tank which are getting fungus all over and starting to die.. I want to know if I can treat the water with malachite green what would it do to the plant when humans eat it? Was told to use salt but that would kill the plants wouldn't it? Any advise much appreciated thanks

[Jordan]

I think you should use salt, I dont think so that salt will kill the plants did you serached about it