I agree, make it a nice mini forest with small pieces of driftwood and get some shrimp in there, maybe some smaller fish as well..plant it heavily, get small fish that won't devour your plants, and make it look natural and gorgeous. 10g can be show tanks too!
I use pea gravel... works well with live plants.
ya i had 3 iin a 20g once.. they just killed eachother