well you just said two years since your live rock. Soo...... any one in your house selling em for some extra money?? B/c i don't know what could take so many fish! I really doubt the hermits or shrimp could have gotten them but you never know.
Sebae Anemone (Heteractis crispa), Long Tentacle Anemone, Purple (Macrodactyla doreensis), and Carpet Anemone, White (Stichodactyla haddoni) I got these from the clownfish anemone compatibility chart. HTH
Algae is produced if you have excess phosphates(green) and silica (brown). Just get a algae magnet. I wouldn't scrape it off b/c then the algae would die and thus produce more phosphates and silica making you problem even worse. HTH p.s. there are many other methods of getting rid of it. You...
I suggest live rock. It helps in the long run. Yep those types of fish would fit in a 30 gallon. Make sure you check their adult sizes first. Then compatibility.