So sorry to hear about the lost fish, what temperature issues were you having?
I was on vacation, the weather got cold and the gas was not turned on in my house so I had no heating. The tank heater just couldn't maintain the temp. Tank temps where dropping into the high 50's to mid 60's, only making it back up to the mid 70's during the day. The temps were not predicted to get that cold while I was away so I hadn't been too stressed about about turning the gas on to the house. Huge mistake on my part. Sucks, they were gorgeous fish. I will probably get some more soon.