I realized my sump is drilled in three places because a protein skimmer was hooked up in its previous life as a reef tank. So I could put a pump out of one end and loop the bead filter back into the sump? And then pump out water on the other end with a different pump to return to the tank? There's only one overflow in the tank with a single hole drilled in the bottom... Sorry for the questions, this complicated plumbing stuff is something I haven't messed with too much.