Ive been keeping fish since I was a kid, but never had a tank that large or with native cold-water species, always tropical or saltwater.
For ich, follow the treatment plan as you are doing then increase your cleaning schedule. Water changes, vacuum gravel, filter medium.
Healthy fish do not get ich easily so that tells me the fish have an underlying issue, usually tank cleanliness.
As for their food, the baitfish with ich, before you feed the larger aquarium fish, shock treatment the baitfish to get rid of all diseases. It's how petco and petsmart take care of their fish when they are imported. I believe you can shock treat the bag they are in, saving you from doing it in an extra tank.
For ich, follow the treatment plan as you are doing then increase your cleaning schedule. Water changes, vacuum gravel, filter medium.
Healthy fish do not get ich easily so that tells me the fish have an underlying issue, usually tank cleanliness.
As for their food, the baitfish with ich, before you feed the larger aquarium fish, shock treatment the baitfish to get rid of all diseases. It's how petco and petsmart take care of their fish when they are imported. I believe you can shock treat the bag they are in, saving you from doing it in an extra tank.
