Seems that my feeder fish tank has something they have been dying off like flies daily ive done every other day waterchanges and no luck. The tails of the fish start to go whitish and looks as if they cant use their tails then they eventually just die. What is going on Ive done a tbsp of salt per gallon to try to treat what ever it is that is doing this but no luck. Should I just freeze all these fish and feed them frozen to my bass?? I know live is not good for them but its what im feeding them for the next couple weeks while im weaning them onto krill and other types of foods.