I am just using a 5g bucket and small pump attached to a hydor I think it is ATO. I haven't had a chance to drill the tank yet and plumb it in but its gonna sit in the factory glass ato spot. The overflow will be bottom drilled and drain into the chamber the display drains into and the return will just be spliced into my main return with a ball valve Sent from my SM-G960U using Tapatalk