Last night I was up late working in my room and i rarely have my room light on after my tank lights turn off. But I saw what little looked like free swinging fry in my tank. To small to take a pic of the were swimging on the side near the room light. The only pair i have is a pair of clowns but they were on the opposite side of the tank. Any thoughts of what it is?? There were over 30 of them