Hey i have 6 juvinile RBP's in a 55g and the tank is up against an exterior wall (i really dont have much of a choice) I had bought a 300w heater to make up for the cold however the past few nights it got cold and my tank has been freezing for the past few nights its 64 degrees the p's arent eating =( i went and got my 100 or 150w heater (not sure which) and put that baby on full blast with not much luck waters still cold. like 66 so then wasting no time the next morning after seeing barley any results i ran out and bought another 300w heater so now i hav 600w going in my tank and the new heater isnt staying on very well WTF is going on it keeps shutting off my fish are going to starve to death if they dont freeze and suggestions till i can move the tank. Blankets insulator etc is there any thing i can do to insulate the heat better i cant loose these guys it took me months to finaly get a compatible shoal they get along and are growing at pretty similar rates