I have 3 fish in my tank. (1) heniochus and (2) clowns. I purchased them all from different places. When I turn my blue + lights on I can see very small pinpoint size white dots on one of the clowns and on the heniochus. They are eating fine and swimming happily. I notice the heniochus goes to the cleaner shrimp pretty often. When I turn the lights off I do not see any white dots. I'm hoping these are just particles that attached themselves to the fish because I see all kinds of stuff floating when the bue + lights are on. I do not see anything on the fish that looks like any of the ich pictures I've seen like below. Any ideas?