I have 40lb of super-fine white live sand but you cannot really vaccum because all you get is sand and of course you dont want to suck all the sand out during every water change. i do not have any fish in there right now. should i add some live florida crushed coral or bigger grain size sand to mix it up. OR if you can suggest, how do you keep sand clean if you have same situation? i did have snails before to clean sand. not sure if that works as good as cleaning it.