My Dewey died!

[renie]

I had 3 adorable albino cories, Huey, Dewey and Louie, who were very very busy and hung out, slept together, etc. Over the last week, all they've been doing is sleeping. I checked my tank temp and it had risen from 78 to 82 (don't know when, but we've had a heat wave over the last 2 weeks). I keep my place shaded, tank is not near windows, and I keep the air conditioning on low while I'm out. I lowered it to 80 and they seemed to revive for a day or two. To my sorrow, Dewey died yesterday, and little Louie is breathing rapidly and spending all his time on the gravel. I do weekly 25 - 50% water changes/gravel vacs, and water testing was perfect. What is the ideal water temp for these cories? I can't find anything online anywhere, but whatever it is, do you think they're stressed from the temperature jump?
:help:

 

[mvigor]

I can't keep the temperature in my 10G Cory tank below the 80-82 range lately and so far they seem to be doing great.

 

[clayt101]

It doesn't sound like a temperature issue. Have you added anything to the aquarium recently?

 

[renie]

nothing, except zucchini for my ottos, which I take out in a day or two (when I can get them to part with it--they latch on to that zucchini like it's their mother!). I've been adding zucchini for at least a month or longer. Before that, I would add lettuce. It's so sad to lose one of them--and he was a pretty good size too!

 

[vtchica]

i don't your problem is with the temperature. my emerald green cories are very active in my 84 degrees tank. check your other water parameters. good luck!