Hey guys i'm having trouble to lower the temp. I think i may have some overheat due to my 6 powerheads (skimmer included). I don't heat during the night, and temp cannot going under 78 degrees. Tried to open them and see if there's stuff in it..nope. Maybe they need lube. Maybe i'm wrong. If i'm right, dya know a good lube or something that can help reduce friction ??