Another con of sand I hear about is aenarobic activities that produces strong odor due to areas that is left undisturbed for a long period of time. In my 75gal, I have an area that the is heavily "planted" with plastic plants which have never be disturbed/sifted for over a year and a half, and so far no smell. Just something to keep in mind. This tank has about 3" of sand, but in my new 180, I think I'm just gonna have about an inch which would make it easier for me (and my fish) to move it around thoroughly from top to bottom. Like Hamster, I'll never go back to gravel either.