High Temps and O2

[bwid713]

There is no "point". There is no certain degree that it changes where you need more. Simply that warm water does not hold as much oxygen as cooler water. When you keep a coldwater fish in warm water, you really really have to add a lot more in. Otherwise the health can be affected in both long and short term.

I never said anything about cold water fish. I asked about tropicals normal temps between 72 and 78

Im askin what you would consider as that "point", not for a scientifically proven number, just your opinion.

Say you had the "general" example i gave, when your u worry about adding extra aeration?

 

[SteveR]

Like he said there is no point. It is determined by how overstocked you are, surface area of the top of the water column, the type of fish kept, ie certain fish can deal with low o2 better, how warm the water is of course, how well the filter exhaust breaks the surface already, powerheads. Not just the temp.

 

[Oreo]

As long as the temperature change is slow you'll know you need an airstone when the fish start scooping at the water surface & pumping their gills really fast. They really look like they ran a mile & are out of breath.

I noticed this in my tank this summer. In previous years I didn't have as much stock in the tank & the fish were smaller / younger. This year the fish are growing bigger & the temp was warmer. It was pretty obvious when the fish weren't acting right. You can band-aid the situation by using ice in the tank to cool the water off for a couple days till you have a chance to make the necessary equipment changes.

If I had to guess a temp I'd say 80*, but your best bet is to just monitor your fish & note the temp when you start seeing the signs.