ok dont listen to these tourists who dont know ****....... Im a native floridian and what he is talking bout is dead bleached by the sun coral..... perfectly legal if its dead..... you can put this in ur aquarium, i have.......... put it in very hot water and scrub, do not use any bleach or detergents because it can absorb the chemicals and kill ur tank ....... it will turn into live rock over time especially if you have it touching other live rock..... i think that is it, dont listen to dumbass tourists! lol