I like the mar*j*** looking floating plant. It looks nice. Plus the fish look great too, good luck with your tank and yeah sand would look great, however, your tank is just one of the few tanks I have seen where no gravel actually looks good, probaly better than having gravel. So to do that in my opinion is great, even gravel has it benefits. Anyways, good luck with whatever you happen to choose to do!!!! Later.