I agree that sand definitely looks better but houses more life then without? I don't know, my BB tank has more life in it then any sand tank I've ever owned. I am not saying this is true with all tanks, but my reef is just going crazy with life. I have more pods then I know what to do with, crazy snails, brittle stars etc growing everywhere. Most of the life comes from the rock I believe. The sand may help, but isn't necessary by any means. I'd use a starboard to have the look of sand somewhat but still be able to clean the tank easy and have better flow. Just my 2 cents.