Give it some time. Many fish will eat brine shrimp before any other foods. It looks more like something they have seen before where as flakes and pellets look more like dirt floating around. It most likely will come aroung for you in a week or two.
Centropyge angels (your coral beauty is a centropyge) are mostly herbivors, formula two is a better food than the formula one for this fish. Frozen is better than flake or pellet. It very common they don't eat the dried algae sheets, it's mostly the larger angels and tangs that will eagerly consume that. I'd try it anyway but if it doesnt eat the algae, it's not unusual.
A few pieces of live rock to "graze" on is often appreciated by centropyge angels too.
Joel