90g is certainly large enough for more than 4 angels. I had 9 in a 75 (this turned out to be too many after several years) and had spawns without the fighting endangering anyone. With plenty of plants offering places to hide and at least a couple of other targets for a pair to harass nobody should get too hurt. Once I understood this the sparring became fascinating and amusing to me. Cichlids are popular for good reason.
If you have any desire to raise a spawning, the tetras become the main enemy to the fry; they are speedy swimmers with better hunting chances.
RAOK Club #76
220g altum, 75g high tech, 6g shrimp: one office, three tanks
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