Several of my fish has signs of something wrong, one of them has a white dot on his eye and another has red spots on his stomach, another has a growth coming from the bottom, one has a small raised patch on his side, they are all rescue fish from my busted out 160 11 months ago. Not sure how to treat the whole tank now 75 gallons or try and take them out and treat them together. Help would be appreciated. Thank you!