As a caretaker you must know that being aggressive in nature, Angelfish must not be kept in a tank having other aggressive aquarium mates, else Angelfish may get stressed and its aggression may increase in an effort to protect its food and territory.
How to Care for an Angelfish: 11 Steps (with Pictures) - wikiHow
Angelfish and sinking bloodworms
FW Angelfish Ignoring Sinking Food - 10/04/12
Hello: I have a couple of angelfish and I have frozen bloodworms and daphnia in the freezer. I find when I put either of these in the tank, it sinks fast and the angelfish ignore it waiting for flakes that float on the top. When it sinks will the angelfish look for it on the bottom?? I do not want it to rot at the bottom. Thank you
General Care of Angelfish - Angels Plus
Angelfish Fry - For the first 3 weeks of their life you will find it difficult to raise any number of high quality angelfish with anything other than live foods such as live baby brine shrimp or microworms. We feed these exclusively for the first 4-5 weeks. Check this link for more details on hatching brine shrimp eggs. Introduction of a new fish food usually requires that it be introduced gradually. Angelfish should be voracious eaters when they are healthy and properly fed.
No one can tell you exactly how much food to put in an aquarium.