hi all..i bought two clowns about 48hrs ago and when i woke up in the morning they seemed to be dead. one was suctioned to the filter intake (which is not strong) and the other was between a magnetic cleaner and the wall. the weird thing is that when i turned on the lights they just came back to life and started swimming. is this normal? also they will not swim in the front of the tank and just stay in a back corner all day. what is the reason for this?