help with Algae build up

[xsirrusx]

I just started a 20 gallon reef tank two weeks ago. i have 20 pounds of live rock, bio substrate(1pound per gallon), 4 snails and 6 hermits. for filtration i am running a protein skimmer big enough for a hundred gallon tank. I have been running a 50/50 compact for three days at 8 hours a day and there is already a large amount of brown algae growing on my live rock. so far i have done two 50% water changes since the rock is in. how can i stop this growth on the rocks before it destroys them?!

 

[Enzo]

It shouldn't destroy the rock, But what I did to fix my problem was add calapaura and a couple snails. It is still in the testing day, since it has only been in there for a couple days but it seems to be working. MY diatoms and detritus are already gone. Two down. All I need to tackle now is hair algae, my snails have already taken all of the hair algae of one of my coraline figi rocks. And the algae seems to stop growing so I think I am good. Hope this helped. Also don't worry about the algae growth. It is perfectly normal. Is your proetein skimmer a seaclone by any chance?