I know a lot of things like HOBs and heaters are grossly underrated for what they should really be using. That is why on our 20 gallon we have a Tetra Whisper 30-60 on it. Anyway, we are going to be setting up a 55 and a 170 (thought it was a 125, but it's a 170, though we are still deciding between that and the 150 they are also saying we can have. Only taking one of the two though... probably the bigger one). What are good heaters and good HOBs for those sizes (55 and 170)