Ideally in any tank you use two pumps so you don't get any stagnant zones and you want chaotic flow. For smaller tanks the 7400/2 does a good job, the outlets are still proportionally large for the flow at 1". The pulsing creates good turbulence. The 7400/2 can also be used with mechanical filter cartridges and a carbon cartridge if needed to polish the water. The Stream 6000 would also work but in an aquarium of this size I think satifactory results can be attained as well with the 7400/2. On my 120 I run 2 7400/2 and I am pleased with the flow. On my girlfriends 75 which is set up for soft corals I am using 1 1600/2 and 1 7300/2 witha single controller and I think it is plenty of flow for what we intend to keep.