I've got a question that needs answering.
About a month ago, I took out two goldfish from my koi pond to put in an aquaponics tank, and they were extremely infested with ich, as in it was (and is) all over their gill covers, bodies and parts of their fins. So, recently I got ich treatment, and decided to see if the other koi and goldfish in the pond were infested and if I'd have to treat them as well. They showed no signs of ich, but the two goldfish still have the white bumps (I'm treating them). Is it possible that the koi have ich, but aren't showing it? Should I treat them, becuase the heavily infested goldfish were in the same pond as they?