yeah ill let it rock like that like i said upgradeing soon and dont wanna disturb the corals now yea i think i odeee with the sand bed lol about 3 or 4 inches i say looks nice in person yoo to tell u the truth my uncle has a tank its about 12 years old dude never tested for anything and he has only lost 3 or 4 fishes in those 12 years wierd i rarely test but hey everything is doing fine.....i mean great had the set up for 4 months now