I had a lot of troubles too but then I watched their support video. I'm sure this will solve all your issues.

http://www.youtube.com/watch?v=9W7yC...bPxq-A&index=8

You might also be interested in this. This guy has two on his 90 gallon tank on the back wall. I ran mine in Reef Crest Mode but you might like the wave maker function instead.

http://www.youtube.com/watch?v=awf9TzBCmGA