what do you want? a small school of smallish tetras? a few cherry barbs, perhaps? aim for relatively inactiveish fishes...ie, i wouldn't put zebra danios in a 10g, they're just too distracting. you could put a dwarf gourami in that puppy. or a trio of cory cats, preferably pygmy cories if you can find them. any ideas on what you're looking for? i wouldn't add much, 10g crash easily if they're overstocked, but you can definitely add one of those suggestions above.