Earlier today I took down one of my betta tanks and replaced the gravel with sand and redecorated. I decided to re-decorate my 20 gallon, too. (I also admit to hand feeding an amano shrimp and a ghost shrimp a flake each, and having my hand used like a jungle gym by another curious ghost shrimp. ) I think it looks a lot better, and my corydoras are loving that sand strip. The little bronze corydoras is very shy, but loves hanging out with his favorite cory buddy. When I first put him in they rubbed bodies and kissed! It was so sweet!