clancaster23
Reefing newb
I will be setting up my sump in a couple weeks and I'm looking for a return pump to match up with the overflow box I have. Problem is the box is basically a DIY job so I'm not sure what kind of gph it's going to do or anything like that. The guy I got it from had a quiet one 4000 pump that's rated for over 1000 gph which I think is much more than needed for a 40 gallon tank/30 gallon sump. Anybody have any clue on how I can figure out how large a return pump I need to get the right kind of setup going?