I just put two MP10's in my rimless 57 gallon, those along with my Ehiem 1260is making it pretty nice in there. I am going to do all SPS so I wanted a lot of flow, honestly I think I could have gone with two 20's but I wanted the smaller size of the 10's in the tank. The flow the VorTechs put out is very dispersed so nothing really gets blasted with a jet of water. So far I think they are great pumps!