I don't see any compatibility problems between the two, but danios are a bit too active for a 10 gallon tank, and both tetras and danios like to be in groups of 5+, I would keep 5-6 small tetras by themselves in there. Neons could be a good option IMO, well see what others say.
I am not replacing them as I am a bit sick of them already (only been a year soon) but they are too fast, the rest of my tank is very peaceful and they just don't fit in.
Having said that, they are little angels. All aggression is kept between themselves and they have never bothered any of my other fish that I know about.