I read an arrival that someone wrote about how a aquarium in the home with the most flow u can get without blowing the sand doesn't even compare to the amount of flow on the calmest reef. I forget what that reef section is called but the ocean there is considered a great attraction due to the calm current. So I say now as long as the sand isn't blowing. Ur good. I have a mp40 running in a 55g with a 1400 koralia in the other side.