What is the best Livebearing to keep which does not eat their young?
Sorry I think they usually all eat their young though a on rare occasions they don't.
I don't have a problem with my guppies eating their young. I have lots of plants for the young to hide in and always feed them a varied diet. They seem to do well.
Ya you could get lots of floating plants too for them to hide in so they are near the surface to get food too.
get some breeding grass or other fine plants which will float. That will help conceal them. Some of them will still get eaten when they venture out, but otherswise maybe set up a different tank and but the fry in that tank.