ALGAE on live rock and back of tank (HELP!)

[nwappleby]

SIMPLE QUESTION:

I have a oceanic 46G bow, and have some live rock with a group of tonga braches. I am getting alot of algae(green) on some of the rocks and the back glass. WHAT CAN I DO? I like the look of a clean live rock, I dont really like the green look of my tank right now......... also I have 2 actinic (36" 30 watts) and on daylight (36" 30 watts), that run from 12:00pm to 10PM. I have a couple of snails (3) but i dont think they are doing the job.

thanks in advance for your help.....

-Neil