I've had like four dwarf angels in a 72 for a LOOOOONG time without problems.
Additionally, I have a lot of customers who have two or more dwarfs in tanks smaller than 72's with little or no aggression issues after the initial introduction.
Not that I'm condoning the practice of mixing these fish at unreasonable numbers, but once in a while, one of us strikes gold and gets away with it.
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This and that.
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