fighting conchs can get 3 inches, wueens get much MUCH larger
and iMO do a lot of work on the sand, the general rule is one per 2 sq ft OF SAND(NO MORE), and they are neat to watch, when we put ours in the tank, they hopped around until they got to where thye wanted to be, it was so neat, and they seem to work all day long, from their shelteer in the sand, anD at night they dcome out and work more