I feed mine a variety of pellet and flake...NLS Thera A, Hakari Cichlid Excel, Omega One Super Color pellets, Omega One Super Color flakes, and Ocean Nutrition Spurlina flake
Didnt catch it but, are your frontosa WC? if you got them at your lfs, did you ask what they have been eating? Generally tank raised will accept almost any prepared food. That being said a carnivorous diet with some veggies mixed it generally is what you need. im a big omega one fan for dry foods at least...