Give them a more varied diet. try feeding them egg yoke the fatty acid will help them grow.
your fry is a bit small but not LOADS, although I would expect them to have some colour by now...
you could move them to the community tank now. they don't look small enough to be eaten and extra room would do them good.
I've never tried egg yolk, though I should. I hear it gives great results.
In my experience breeding moscow guppies, I don't have colors at two months. Every now and then, I get a male that doesn't get his colors until six months!
Also in my experience, a two month old guppy will be chased around by adult fish because they are still rather small. I would also keep them in their own container because the feeding needs of a two month old guppy is very different than the feeding needs of an adult fish.