I keep bettas and the brand I trust is Hikari. I feed my bettas Hikari's Betta Bio-Gold Baby Pellets, and from time to time, I'll feed them Hikari Frozen Bloodworms.
Dannios: O.S.I. Freshwater Flake Food and the occasional live brine shrimp (and the algae wafers they steal from the pleco! )
Pleco: Hikari Algae Wafers
Triggers: *Takes a deep breath* Frozen trigger formula (can't remember the brand right now), live brine shrimp, Hikari frozen brine shrimp, frozen shrimp soaked in vitamins, and I just ordered "Kent Carnivore Pellets" online to try out
Betta: Hikari Betta Bio-Gold Baby Pellets, peas, and the occasional live brine shrimp
Hikari is my favorite right now... my fish love it!
I feed mine the full tetra range and the king fish flakes, i try and give them the widest diet possible, because nothing give me more pleasure than to see them come to me when it is feeding time...