how long has your tank been set up ? i also had a problem with hair algae. as jedininja posted, i also cut down my lighting time. it took a couple weeks for it to finally subside but, that was the day i went and bought timers and set up a lighting cycle. the only problem i see with your setup is that you have your corals which need the light. i would check out what is recommended as a minimum lighting peroid for what you have and go with that for a bit. one last question, do you have your tank near a window? this could also cause a problem.
hth,
chris