I've watched tons of videos but I'm still confused. Can someone explain a basic sump setup in stupid simple terms for me please? Or refer me to a video or website that does? First saltwater tank. I have bought a few pieces of equipment for it so far such as a skimmer, overflow, pump, and the actual sump box. I probably have more stuff I'm leaving out but I keep finding sump equipment secondhand and picking it up for cheap so I may not need all of it.