i have this 55 gal reef tank set up and alot of the base rock and all the sand is str8 form the beach sinc i live 5 min away, in FTL LAUDERDALE FL. can beach sand be bad for a tank?? i have had no problems but my two friends each just set up tanks like a month ago and there ammomnia is still high and nirtrites are up. i think its stll cycling but they went to a pet stroe and i think they got some bogus advice from a guy there. he said sand from a beach is toxic to tank, it has "some sort of bateria that will make the ammonia always be high". i think its BS, anyone have some comments? alotta my stuff comes from t the beach, rocks sand, polyp corals starfish, cucumbers, numerous fish. i have not been able to keep a fish in a hile except for my PJ cardinal but that is cuz of an Ich infestatio which i have pevious posts on.