I've got 5 blue rasboras and two clown killifish in my edge 6 gallon, and they appear to have plenty of room. However, unless you're set on schooling fish there's also bumblebee gobies, which are pretty sedentary, and also pea puffers, which you could have at least one of. They're active and interesting little fish, but absolutely murderous. Finally, scarlet badis's are beautiful and fun to watch, if you can handle live food. I know what you mean about the information, sometimes people here say you shouldn't keep any fish in a tank under 10 gallons, and they are ADAMANT about it. And then sometimes people have a school of small fish in a one gallon and everyone is cool with it. But as long as they're healthy, and not obviously bored, you should be fine.
Last edited by Ckent42; 01-23-2015 at 10:07 AM.
Reason: accidental posting