I usually do smaller water changes, but to each his own. It all depends on the biological load your aquarium is handling.
Some people have had trouble feeding blood worms, because they MAY contain parasites. I feed frozen blood worms once in a while and have never had a problem with Hikari brands. Most aquarium fish seem to like brine shrimp, and it's sort of the old standard in the aquarium hobby, at least on this side of the pond. Most evenings, I feed frozen brine shrimp and make sure it is well thawed. Live food is another thing entirely; you have to be very careful of the source.
At any rate, I'm glad your angelfish is doing better. Maybe he just ate something that didn't agree with him.
