Probably seaweed/nori. Not a real fan of dry fish food due to all the fillers and other nasties that dirty the water. I do keep some PE Mysis Pellets on hand as backup. Frozen LRS Reef Frenzy is my food of choice.
New Life Spectrum pellets. Don't use them often but my fish all readily eat them. Usually feed a variety of frozen (Hikari mysis, blood worms, LRS, angel formula)
NLS pellets: this is the biggest winner for my tank, pretty much all fish eat them. next time i buy any pellets i'll probably get those NLS probiotix ones
PE mysis pellets 1MM: these seem fine, but the 1 mm is tiny and most of my fish don't notice them or eat them, save the wrasses
NYOS algae and wild goji pellets: opposite problem of the mysis pellets, too big seemingly for most of my fish. wrasses like them, but you can tell they're kinda big and they have to chew them a bit to get them down. other fish are either incapable or not interested