01-05-2012, 09:14 AM
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Angels will eat small fish if they can fit it in their mouth, think neon tetras which they particularly like.
But you said the one you have is small (they get up to ~6 inches in length). If it's still a baby from the store (~1 inch) it isn't going to be eating other fish... that are alive at least.
As others have said, fish have no problems eating other fish that have died, and they can do it quite quickly. Look very closely at the base of decorations where any remains would get caught up from the current, you won't find much left just a few bones.
As for cause of death... could be stress, could be bullying, could just be unhealthy fish from the store (on account of the platties, you said you had the danios for awhile).
However, in regards to the Angel fish ... they, like a lot of fish, prefer to be in a group of 5 or more. Since they get to be large fish, you need a large tank for that many (55+g). If you manage to get a mated pair they can do good with just the two of them. Otherwise they fight with each other. That dosen't always happen, but is probable. When I first started and didn't know anything I too got them, three. One was killed fairly quickly, the other two lived on but did not get along well (29 gallon tank). When I moved, the largest one didn't survive long, and the other turned into a very aggressive jerk and had to be moved to a different tank.
I'm now dreaming of a 120g tank specifically to be centered around Angels =)
I'm afraid I don't know much about cichlids. I've only heard the advice that most of them should not be mixed with community fish (Angel's are one of the exceptions, they are peaceful if kept in the right conditions). I don't know about Parrots.