hi guys. I currently have a 350 gallon tank running with a 150 gallon sump tank filter. I need to bump up the temp to 31 degrees celsius since one of my rays is not eating well. I am using 2 pcs of 300 watt heaters on the tank. I notice that when i set the heater temp to 31 the tank's temp is 28.5. When i adjusted the heater to 33 the water on the tank is at 30.1. I plan to just keep on adjusting the heater temp higher to obtain my desired tank temp of 31. Am i doing it right with the heaters or is there something wrong ? thanks guys !