Did you try and treat the fish when you noticed they had ich? And the best thing you can do is wait for about 2 to 3 weeks and see if they get sick. And vacum clean the tank because those little "salt" particles that were on the fish fall off into the gravel and multiply. Then your other fish will get it. And you should treat the tank for a few days for ich to make sure you killed all of the ich. And what size tank are we talking about here?
