Dermogenys pusilla. I don't think flake is unhealthy for them as far as I know. I bought two (females) as they were all the store had left and I sort of wanted to "test" them before getting a whole school. So far I am liking them and I will probably get a few more soon.
Haha, thought you would like to know.. I did end up getting a pair of halfbeaks. They are pretty calm, eating flake food no problem. A lot less trouble than I expected, and I may have to pick up more of them.