What area of Flordia do you live in? I live in Panama City Beach and we took all our sand from the beach. The problem we had though was that we did not go out far enough and the sand had some chemicals in it that had to work themselves out.
I think the further out that you go, the better off you will be. Also, dont tell the folks at your lfs
that you did that because the will give you a hard time about it if they are any good.