I just picked up a Seio 628 for my 38g (3'). I removed a 802 from my tank (too much space taken up with the filter), and put the 628 in its place. Along with that I have one MJ1200. I didn't get as much flow as I thought out of it, but then again, its my first time with a stream type of pump. So far its not bad, I'm thinking however I should of gone with the 820.

Maybe down the road if I upgrade the MJ1200 to a 628, there should be just enough flow.