No! You dont know who urinated on that sand last! Nah, on the serious side, I wouldnt put anything in my tank straight from the ocean. You really dont know whats in the sand. Some people say its ok, but come on, common sense tells you how much pollution is in the ocean. Yeah, it may be diluted a lot but still, it only takes one molecule of something bad. Sorry for rambling, so no, I would definitely not put sand from the ocean in MY tank. HTH