Originally Posted by honzicek
the water at 78F-83F is ok? I have 2 air stones in tank and my friend tell my 83F water is ok if i have lot of air in water.that is true???
First on the temp, why is it variable from 78 to 83? Your heater should be set to a specific temp, say 78F. If warmer weather causes the tank to heat further, no problem, that happens. But the heater should be consistent itself.
For the fish you have (and I can't verify, because your initial post is missing from this thread) 78F should be OK. The black moors will find this very warm though, and may not last long. [If your wife likes these fish, tell her to get another tank for them
.] The others are OK at 78. I wouldn't have it normally higher [again, if that is due to weather, let it go].
The warmer the water the less oxygen is can hold. As the water temp rises, fish find it increasingly more difficult to respirate (breathe). Adding airstones moves the water and increases the interaction between water and air at the surface, which speeds up the gaseous exchange in which oxygen enters the water and CO2 (carbon dioxide) is driven off. So when tanks get warmer, airstones can be added to increase the oxygen and ease the stress on the fish. However, this is not to be used as a permanent measure, having the temp deliberately too warm then thinking airstones will compensate; they won't. The fish are "comfortable" within a given temperature range, and that should not normally be exceeded. Temporary hot weather is just that, temporary.
Some of your fish, like the neon tetra, will actually weaken and die from temperatures around 83F. They come from cooler mountain streams, and temperatures around 75-77 suit them. But at 78F they'll be fine. But not at 83F long-term.