Got a 'dsb-in-a-sump' setup. Basically it's a plastic container with 6" of SeaFlor aragonite, ulva, a light and flow taken from the return manifold. Those suckers are in jail and they ain't gettin' out. The pods can keep 'em company.I’d tread very lightly on putting crabs in the sump had a friend who did just that and they destroyed all his equipment