they are eel looking with tons of personality and if you have a bigger snail shell they use that as a home!!! better yet they love when you stick pvc piping in the sand the they climb through em i love mine!!!
You can also try a royal gramma, a type of cardnal, or one of they types of fire fish goby. I am not sure what else you have in your tank, so those are a few suggestions off the top of my head.