I have a pair of painted glass fish (did not know that they were artificially colored) and one of them has got ick (fins has white dots like salt/sugar particle) for last 2 weeks. In the beginning I put that fish in a half gallon container with ick guard medicine. 12 hours later, it was in terrible shape and floating near the surface (probably ammonia went up). i put it back to the community tank and couple of hours later, it was doing fine. I know that painted glass fish are weak and don't survive long. Should I do anything? Also, would this ick can affect other fishes (they are doing fine for last 10-14 days)?