Sand might look good, but if you have fish who like to dig like crazy it will be all over everything, LOL. Aside from that hope you never have to do a 100% water change with a tank that has sand in it as it stinks soooooooo bad youll wanna vomit till ya die. No kidding. I had to take the sand out of my tank because the dragon fish was making such a horrendous mess and getting it up in the filter as well. What a weiner, he loves digging though
I swapped out the sand for some small gravel he can shovel up and move aroud.
He loves it just as much as the sand so hes happy, and so em I. Nomore mess or stinky sand :P