was wondering if i could put shells like conch,scallop,abalone or sand dollars in my future tank it is going to be mostly sand but will put up live rock piles with alot of caves in the back corners of the tank with brain and stony corals on top as well as shaveing brush but occupants will be 1 chain moray,1 jewel moray,1 cortez or yellow stingray,1 epualet shark,blacktip grouper and some tangs bor wrasse also tank is going to be 510 gallons with a massive sump and skimmer plus mangrove nitrate absorbtion but was wondering if could put the above shells in tank or will one of the fish choke on them or something?