Granted I am a novice, so please bear with me. I have had a nano cube 13 gallon tank for 2 years. In the tank we have live rock, snails, cleaner shrimp and one clown fish and one royal gramma fish. "Nemo" for the past year has had a habit of ending up "on the other side of the tank", you know where the pump, filter area is (the narrow area with water). We have had to net him out at least 10 times over the past year. Tonight, he was not around for feeding time, so I checked his special go to place....he was STUCK in the pump, dead. WTH???? Anyone have this experience???? He was the only one to ever end up on the other side. What in the world??? Please help