Iamtechno13
Aquarium Advice Freak
If fish are uncomortable in the tank that they are in due to the ammonia being a little to high, or the pH is off or has moved a little bit, or for a number of other reasons especially since it is a new tank. It could possibly be a parasite which is why you need to pay closer attention to them but if you are checking them and can find nothing wrong with them other then them flashing, are you just going to start putting chemicals in your tank? If it was ich, you'd probably see it as it stands out fairly easily.