Ok I have a 39 gal cube with a full lid except the back 3 inches for the filter, heater, skimmer etc.
I bought 5 days ago (first fish in tank)
1 Pecula Clown
1 Chromis
1 Cardinal
Other then sand, live rock and 6 snails that is all I have in it. But today I come home and the Clown is gone...