I have a 20 gal cycling and I put a coralife 65 on it, it was too big for me. might use it for curing lr for 90 or 220 that I am looking at. I am going with the Aqua C nano, rated up to 25 gal tanks. The next model up from that is about $50.00 more and rated up to 75 gal tank.The dimensions of the pumps that go inside your tank are the same for the nano and the remora, but the gph are different along with the dimension of the housings that hang on the back.
Hope that helps.