I noticed one of my rainbows flash a couple of times on a leaf. Both times he rubbed the front of his mouth against the leaf. Looking really close it looks like he has one tiny speck of something on the top of his lip. Its so small I would never had seen it if it were not for the flashing. Didnt see a speck of anything on any other of the fish. Tank only has Blue eye forktail rainbows. So does it sound like I have ich in the tank? If not what else could it be and if it is what is the best approach for a tank with shrimp in it?