I would say endlers as my first choice (I've never seen them bother their young) but if you want to watch some excellent parenting behavior, try convict cichlids. But be prepared for lots of babies that nobody wants Mom and Dad are very watchful of their fry... to the point of attacking the glass if you get too close while watching them.
Aside from livebearers, Kribs were fun for my family. We had them in a species only 40B. Lightly planted, only a few stems and lots of fissiden. It was quite the experience to watch the parents bring the fry out to search for food.
Pelvicachromis Kribensis are very easy to breed and they take very good care of their young. They are a true tank beauty and are pretty hardy as well. Their mating rituals are very awesome to watch. their colors get very bright and vibrant when mating and while they have fry. I would def go with them!