I, along with most others on here, will stay away from Coralife products. Take a minute and check out Buckeye Field Supply. One of the better places to get a RO/DI unit IMO. Plus Russ will answer any questions you may have too.

www.buckeyefieldsupply.com

and here is a link to the different supply fixtures:
http://www.buckeyefieldsupply.com/sh...ry=187&Sub=133