I have a urchin which might be a t, toreumaticus, I believe that it's considered to be a carnivorous urchin, really slow but does his work really well as a clean up crew, but i believe that since he's so slow he will not be able to take care of my 210g tank with my 3 feet fat Tessalata in there so I am planning to add a brittle star, will this be an ok decision? I would also like some other clean up crews, if it weren't for my moon wrasse i would've definitely gotten atleast 10 huge nassarius snail's