Chaloupa,
Have you got glass tops on them?
I opened my glass top 1/2 way and it made a HUGE difference. I can't take it off altogether, just yet. I have to get a new set of lights first. Then I'll be puttin' in a sump with an auto top off to deal with the extra evaporation without the glass top. (No top means more evaporation, I've learned). I'm hoping, though, that the lower temperature will sorta even that out.
At any rate, hopefully this will be enough to solve my overheating when the weather gets hot. Those chillers are crazy expensive and there huge, too. I suspect they probably draw alot of juice also. So, for now, I'm chillin' on the chiller.
Cheers.
PS. I'm also runnin' a wall mounted fan that is blowiing down onto the tank. Managed to maintain 78F over the weekend.
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Mark.
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