I've had a flower horn pair with a bigger Midas, and he would often change between dominant and submissive depending on her mood. She laid eggs, but was paranoid and wouldn't let the experienced male do his job. A few days later (and many failed attempts from the male to help care for the babies) she ate them and he flipped out. Nearly killed her before I could separate them...
Point is that it's possible for a smaller male to pair with a larger female and behave submissively, but its usually short lived
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