The Coralife is the definition of bad. I suggest you look at one of these if you don't want to spend too much.
http://www.aquacave.com/Turboflotor-...P2202C616.aspx
I have one and it does a decent job for the money spent. I run it on my 70 gallon and its been flawless in its operation. I had to make a silencer from a pill bottle though as I like it quiet.