i had to net out a damsel fish today and tore the tank apart and when i put it back together one of my 2 clowns is just gone like out of thin air. i checked all the tank all the rock and all the room its tank is in. where could it have gone i checked filters and everything. and is it ok to mix a orange ocellaris clownfish with a black ocellaris clownfish incase the missing clown is just never coming back