algae?

[parkinsn]

Originally Posted by lastlight

Still have crabs though... Sorta nice being able to always find them and show them to people.

^^No comment.

I would try a clean up crew first, before anything else. You may find that your crabs will eat your snails for their shells. Have bigger homes for them to avoid this.

I'm with Brett, crabs can be a PITA for crawling on, and picking at your corals. Snails are nice for cleaning the glass though.

On topic, if you post a pic you will get a better ID.