Return pump makes my tank hot, also inside and outside temps. I’ve gotten my electric bill down past month by keeping air offMy tank runs about 5-6 degrees above the house depending on light intensity. Keep the surface flow high and add a fan maybe. But honestly have no idea why your tank would be so hot. Sorry
Also I’m sure now it was due to my light not being high enough. After adjusting my light height the leopard wrasse started swimming at the top of the tank more. Back active as the first day I brought her home
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