A twenty extra high is the one with the footprint of 10 gallon tank, isn't it? 10 serpaes is the right number for a school, but without enough swimming room they will be nippy. They would be my suspects for the guppie killers. Two itty, bitty angels are fine, but when they grow up they will either fight each other or pair up and turn on every other fish in the tank. Although your filter seems to be handling all the ammonia from those fish, I think you will find you need a lot of water changes to keep the nitrate down in such a small tank down with so many fish. Your stocking is appropriate for a 55 gallon tank.
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