im new to this ..ive got a rio 240 been runing for 2 weeks now i need the temp to 30 and only gettin 27-28 the haeter that came with the tank was a 200 wat which i was gettin 27-28 so got a 300wat heater still readin 27-28 and thats with a 50wat on the other side .. ive looked at what power head that is in and its a 600 now ive seen that i can use a 1000 head would this be a better flow. and get my temp up to 30 or not thanks to all for the help