eschaton
Fishaholic
Is there a particular reason you're stuck on the idea of a single fish? There's a lot of cool things you could fit into a small tank, including mated pairs and small shoals. Outside of Bettas and a few related fish, virtually everything you can fit one of comfortably in a 10 gallon is going to make the tank look pretty damn sparse.
I would suggest one of the following
Small group of Bumblebee Gobies
Small breeding colony of Endler's Livebearers
Pair of Peacock Gudgeons
2 Pair of Scarlet Badis
Pair of some Killifish or the other
and so on.
I would suggest one of the following
Small group of Bumblebee Gobies
Small breeding colony of Endler's Livebearers
Pair of Peacock Gudgeons
2 Pair of Scarlet Badis
Pair of some Killifish or the other
and so on.