Any pump will work to feed the refugium. I use one of three return lines from the MagDrive 1200 in my sump. I have a valve to keep the folw rate around 150 GPH thru my approximately 30 gal refugium. Then I have 3 2" drains siliconed into the refugium that allows water to gravity return from the refugium to the display.Real easy if you have to room.:thinking: