Tank is 3 months old and I added two clowns a week and a half ago after tank cycle. 1 died two days ago and found the other dead today. Water levels are perfect except nitrates are between 10-20 but not that bad. The only thing I can think is that my air conditioner went out at the end of last week and has caused my tank temp to increase to low 80s but the firefish is doing great so I don't know what happened. I acclimated the over about a 2 hr period adding some of my water every 5 or 10 minutes. Anyone got any ideas?