Zoo ID Needed and Possible Clam?

[FeatherDuster]

The zoas will color up more if you have low phosphates and bright lights.

The clam is probably an oyster. They encrust rocks. The very nice ones are "thorny oysters" and are very attractive.

The clam will survive if it gets phytoplankton. One form is the green film on your tank glass that you clean of with scraper, the other form is DT's Phyto in a bottle.

Thanks for the Zoa advice. I try to keep phosphates low since I previously had a slime algae (too lazy to lookup formal name xD) problem. My lighting is actually pretty decent. 96W over 10G. They look pretty bright (brighter than in the store) but my camera is a low end one and doesn't do them justice.

Luckily I target feed live phytoplankton to my tank already. I use it to feed my feather dusters.

And thank you all for your great comments!