I have a friend who has wanted a tank for years. Two months ago I gave him my old 40 gallon tank. A couple of days ago he called me up to look at the sand and live rock he got. When I got over there I saw this execelent looking live rock. Come to find out he went snorkeling and got all the rocks he could get. Then he filled up a bunch of buckets of sand from the beach in about 5 feet of water and put it all in the tank. I know this is highly illegal but are there any problems that could come from this. He has offered to give me some for my tank, but I first off I only believe in aquacultured corals and such. Second, I am worrried about putting this stuff in my tank. This rock and sand is all from off the beach in s. florida. I know this is wrong and I have been explaining this to him but can it hurt anything in his tank?