bsmith, I'm not sure about that. They're always looking close for food in crevices, hovering slowly among leaves, inspecting the substrate, going through clumps of moss and monosolenium. They are voracious, and swallow large for their size, say, 2 week old baby cherries are still a snack. If breeding is not your goal, it should be quite fine. Adult shrimp are larger than the fish.
Searun, the other species could be Dario hysginon and Dario dayingensis, both solid red. There are also Badis, very close genus (in fact Dario was recently separated from Badis). All in all, my advice is to get a group of both species if you can, given they have females, it's a great find. The price is ok. Space is far from a problem, since they're so small you can appropriately keep 6-8 in a 10 gallon. The Mini-M is 36x22x26cm (5 gallon), you could house up to 5 if you get 3 females.
Badis species are larger, not suitable for such a small tank, double check species.