Go to your normal LFS, hopefully a good one, and get RO water. It's only .50 a gallon, and it'll help tremendously to get rid of the algae. Then, get 15 astrea snails. I'd say get more, but not enough rockwork. Once the algae's gone, call me for some zoos. A sinularia would look great sticking out of the side of that rock, growing upwards, and a nice gorgonian out the other side. No gorgonian till the algae's in check, though.