Wow, do they normaly pic stuff up that quickly? This is mine got her on 02/15/10 still only has ruble.
I really don't know - I've read that they do but this is my first one. This one was wearing its fancy zoo and coral pajamas on arrival. Just figured that was a great bonus!
Take a look at this
http://www.youtube.com/user/talmozes#p/a/u/2/rG4XqDaEPHI
The downsides Jason is that they pick up everything as my video shows and knock stuff over. If your reef is fully glued down then great, if not get a Diadema urchin as they don't pick stuff up and they eat a greater variety of algae.