Ok im about into week 3 into my trek into a cichlid tank. The past week I have randomly noticed seeing a random fish kind of scratch the side of himself some against a rock or decoration. Every time i see them do it its once or twice and then the next time its a different fish. Water parameters are looking great 0's across the board except No3 at .25. I never owned cichlids before so is this normal? I have seen this as a symptom of Ich but i don't see any salt like grains or any other different in appearance and this is a few different occasions over a weeks period on a different fish each time.