Great looking fish. Just want to ask a couple of questions about your tank.
Is it just the one species than you have in there?
How many fish in total?
How many shells per fish do you have?
Also what type of filtration are you running?
I currently have a pair of L. ocellatus (Whitestrain) and many L. multifasciatus ( I started with 6 wild caught multies and have since traded about 60 young multies to my favorite LFS).