I hear they get up to three inches and a 10 gallon is pushing it. I think that the biggest fish on this list is 2.5 inches.
Mosquitofish aren't *so* tiny. I've caught females pushing 3". Maybe some of the numerous Mexican mosquitofish would be OK in a 10 gallon, but not the common Gambusia affinis and G. holbrooki of the US.I had no idea about the mosquitofish, they're so tiny!
I suppose you could keep a bunch of male Gambusia in a 10 gallon, but I'm not sure why you would want to. They just look like guppies, but without the bright colors and peaceful attitude, and you won't see any interesting behavior in a single-sex tank.Do you think males of that species would be suitable for a 10 gallon?
Yessss, that's it Jayhawk. Well, I guess it will have to go under the heading of millions of killies.