fire fish are jumpers so its very likely it jumped out if you dont have a lid, i had one jump from the tank into the overflow box twice, so check around your tank and in the back of the tank.
Thanks i appreciate it. but i really dont think its over stocked when its night none of them are fighting for position or being territorial about there sleeping space. and as it says online yellow tangs are fine in 60g +tanks blue tangs you can keep in even smaller tanks around 40 obviously not...
I left town for the weekend came back last night and one of my clarki clowns are breathing really fast, not eating and not swimming much. I tested the nitrite nitrate ammonia alkalinity Ph anything that might be causing this but everything seems to be normal. the weird thing is its only one fish...