I have a Jebao DC-12000 that works flawlessly and has adjustable flow. You can have it for $50. I'm in North Colorado Springs. (zip code 80924). Here's a link to it on Amazon -- Normally $150. What I love about this pump is that it was strong enough that I created a manifold and could use the pump for other things like reactors, recirculation in the sump, etc. but I could also put it on the lowest setting just for return. The 10-minute feed button, slow startup, etc. is awesome. https://goo.gl/DrBZ2W