ken in all honesty id spend and get the ati sunpower 6 bulb or a tek elite 6 bulb, cant go wrong with either if was my money id save the $ and get the tek, has great reflectors as well they added the fans to the fixture
6 bulb would be great in a 57g to do sps. Plenty to keep it happy.
The elite is really an amazing fixture. It did not fit my tank sadly and I got the 4 bulb tek fixture. Even 4 bulb and my sps are growing and coloring up every day more and more! Tek fixtures are amazing. Completely agree with reflectors. Best individual reflectors I've ever seen!
you can keep sps on the sand with that fixture, i have a little bigger tank then yours and have the 8 bulb and both clams are on the sand and a few sps, absolutely love this light