I have a 45g corner with a 20g refugium and before I added the fuge my nitrates were between 20-30ppm now they are around 0-5ppm. I only spent $100 about $60 for the return pump $25 for the overflow and $15 for the tubing and 3 baffles. I think it is well worth it I hide everything in there and when I do water changes I never touch the display tank. Also when I add my calcium maintainer, and carbon or any other stuff it goes in the fuge first and has a chance to mix before it goes in the display greatly reducing the chance of anything falling on a coral and killing it.