The rainbowfish in the picture is Melanotaenia boesemani. It's either a female or juvenile and will grow to about 4 inches. They need hard alkaline water and should not be kept with Pseudomugils or anything small.
Oh yes of course, but she was on her own and I would love to have her and then stock it up to about 6 or so. But my point is I can't provide full space yet and she would need to be in a 5 gal for 2 or 3 weeks, but I know several places I can get more boesmani within a 15 minute drive.