Everything will be under the stand except the container for evaporation.I'm drilling a small hole thru the wall to the storage room.The ATO controller and pump will be under the stand and the airline tubing will go thru the wall to a 10gal. container.The Lifereef system are pretty narrow.I still have 8-9'' front to back for the return pump or anything else I would want in front of the sump/fuge.I forgot to mention this earlier...the Lifereef has mounting for float valvles and small-pre-drilled holes for tubing for ATO,dosers(kawk),etc.What can I say,I'm loving the design Jeff incorporate into the sump/fuge he makes.