i have the heater (new visi-therm) set to 76degress but the highest i've temp i seen that the tank has is 72 and i got good curculation cus i got the penguin 330 on the right side then i have a power head connected to a tube that puts water next to the filter and i got one airstone on the right side and one on the left side.....and my heater keeps shutting off.....its a 200 watt in a 55g