I also have a 57 gal. Run three hydras 26's and three 39w T5's with actinics.
Hydras running with blues at 85% and whites at only 7%, and I have mostly sps and a few high end favias and chalices doing very well.
I love this tank. My opinion on Leds, go with more fixtures for proper coverage and add some t5's if you plan to keep sps long run.