Right now I have a 10-gal aquarium with 2 zebra danios, 2 longfin leopard danios, a chinese algae eater, and 2 dwarf aquatic frogs. I was thinking of get a dwarf puffer or two to add to the aquarium, but I read that they can be nippy, so I was concerned esp. about the longfins. Any suggestions? Would they make a good addition, or should I hold off?