I run two 800 gph power heads in my 40B, also. Ditto on fish loving the flow...In my 40 breeder I have 2 800 gph power heads and one with variable speed at 100 to 1000 gph. It is a lot of flow but the animals seem to like it.
It may take a little while for them to adjust to the higher flow, but your fish will love it. It's healthier for the tank, as well as giving fish the exercise they need. Reefs aren't exactly calm.Dang! Ok. I think I'm running right around 270 with two pumps. Just ordered a single 540. Also ordered a refractometer, the wife accidentally broke our hydrometer after doing a test. Hopefully my fish will like a little more flow.
I have two Jebaos in my 125 and one in my 40b (another is on its way). I love them.Jebao is affordable variable speed pumps. Something to consider