It really depends on the shark, in my experience. Currently, I have two rainbow sharks in my 29 gallon, with 5 neon tetras, and 4 black neon tetras, amongst others. They get along fine, and don't ever seem to bother each other. But I've had more aggressive sharks in the past.
I got about 12 black neons with my RS in a 29g, it does not even notice them.
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