Hi, welcome to monster fishkeepers.
There are several good foods you can use. The pleco would benafit from Omega One Veggie Rounds. The Livebearers and danios could eat NLS (New Life Spectrum) .5mm pellets or Hakari Micro pellets. A good quality flake like Omega One can also be used but I like the small pellets better. Hope to see you around the forum.