small overflow box with...
two 1.5 drains cj standpipes, two 3/4 inch returns, one 2 inch dry run for wiring and electrical. 300 gal display. Running only about 1500 gph via reeflo marlin in basement.
The sump compartment that feeds the pump will run dry and the feed will stop if the drains become clogged (my ato shuts off after 8 minutes). However, an additional dry drain is a great idea if you have the room!
R