I'm using an eheim 1260 on my 210, just because that's what I had laying around. It draws 65 watts. Going from several tanks, I've decided to make mine as energy efficient as I can. I've also got an mp40 that's mostly unplugged. At 33 watts, it can sit. I use it to "dust". For flow, I'm using a korallia magnum 7. Draws 12 watts and has great flow. I wanted a submerged return to use the pump to heat my water, instead of using a heater. JMO, no need to send more through the sump than the skimmer can handle. If I planned to jam 3000 GPH though my sump, then, I'd need to upgrade my skimmer pump to process that much...I've got the pumps to do it, but for me, the ehiem 1260 works fine. Mine also feeds my refugium at the same time. More flow won't hurt, but isn't required. Mine is mixed lps, sps, anemones, and fish (16 of them). YMMV