Yes. I havnt testes mine in a while though, but the algae hasnt been that bad since I added the sponges on the ends of my power heads like biff suggested, it seem all the algae goes to the sponges. I have to change the sponges out every day because they turn from white to dark green, so every night i take it out and wash it and replace it with the one from yesterday.
I read something completely interesting that makes sense if you look at tanks with gsp, kenyas,zoa, buttons, xenia etc the one thing you dont see is algae reason being these corals need phosphates to live. Figured Id share that with you.
Really, that is very intresting. Thankyou for sharing. I didnt want to add anything else untill I got the prob figured out but I think I add some of the suggested. Zoas are my favorite and I know were I can get them cheap to top it off.