i plan on predominantly keeping those species, just wondering if anything comes as like a pellet or something thats fairly cheap with a long shelf life that could feed those species

Formula 1 Pellet

Great husbandry will keep all those looking great!

I use reef chili which you can get at BRS. Seems expensive but it lasts forever. My all my softies love it. also, I had decent growth before I actually started feeding them, but now they have really taken off, I mean wicked fast growth.