Before I venture out to home depot and start buying things, I wanted to ask here and see if there is a simpler solution to connect from PVC to my return pump. I recently acquired a 75G reef tank pre drilled and plumbed for reef, in an effort to plunge into reef-keeping. All of my experience is in freshwater, I am still learning about the saltwater side of the hobby, so I apologize if this seems like a stupid question. I bought a used mag 9 pump to use as return from the sump. My question is, how do I connect the pump to PVC without making it permanent and hard to maneuver. If I use a female PVC plug the rest of the way, connecting the pre-existing PVC to pump, will I be able to make sure the pump sits on the bottom of the tank, and be able to move it if I need? or can I go flexible hose and connect it with a hose clamp to the threaded part, of both the PVC and pump, will that be leak proof? looking for any and all ideas... I am planning to simply use the sump for skimmer, heater and return pump at the moment with frew live rocks, I will worry about room for dosing and other stuff later, so essentially my plumbing needs are to connect return pump to the tank and connect the drain to filter sock. how do I control the return to match the drain so the water level in the sump is maintained steady?