Alright I have a 14 gallon Biocube. 1 clown fish and 1 dragonet. I just added a fire fish 2 days ago and he was doing fine. I fed the fish and coral some mysis shrimp and he ate it. He was swimming around and stuff. But yesterday he was out until about noon then we went to a side of a rock where he slept last night. He stayed there for the rest of the day and I wake up this morning and he's dead. Not sure why....
