For pellet auto-feeding, I use TDO Chroma Boost, Seaweed Extreme and a black-worm based pellet. You definitely want to use a floating feeding ring to keep pellets in your tank and out of your sump. I'm always amazed at how well fish can keep time and how they gather around the feeding ring before the pellets drop.
I use Hikari Marine S for my fish, corals, and nems. From my 3/4” Biota coral beauty to my 5” golden head sleeper they all love it. Even my no longer herbivorous lawnmower blenny