Hi all, I'm sorry if this is answered elsewhere but I couldn't find it. I have the Evo 13.5 with the Fluval M50 50W Heater, and it'snot getting the job done. Cant get the water above 78 degrees and often lets it fall to 76, I'm wanting too keep it consistently about 79 degrees. I don't want to drop a fortune but I at least want the thing to work. Any suggestions?