i know my heater shouldn't heat the water if its at temp but one that came with the tank when i bought it kept over heating, so bought a new one, but did the same so i unplugged it about 3 - 4 weeks ago ish an not even needed it, it might just be that the temp in the room is high, hubby's allways saying he's hot, so tomorrow i'm off to see if i can find a room thermometer? if can't find one then just not worry about it for now, just leave it unplugged till it doe's start to drop a little, as at min its readin 28oC. but not alot i can do to be honest but it just dosn't feel that warm in here? oh well never mind fish seem ok at min, sure ill notice if they wern't lol