Hikari Seaweed Extreme pellets (I think that was the name) - soaked w Selcon. And nori clipped - but never seems too interested in the nori.
Is this the only food you're offering? Even soaked in Selcon, that's a fairly limited diet for an angelfish - they're pretty omnivorous. Not saying that you have to, but I offer mine almost a dozen different frozen (mostly blended) foods, as well as periodic nori, clams on the half-shell (they're in the display - a littleneck clam is gone inside an hour) and other treats. Pellets and flake too, on days when I'm home at lunchtime. Betweentimes, they're constantly picking at the liverock for algae or ... whatever.
~Bruce