Thats not really true, and usually if you have two in a tank, they will change sexes to form a pair anyway.
The larger and more dominant is probably the dominant female the she could be battering the smaller male. I'm not sure why you would ever suspect a parasitic infection....
A pic could show how bad this is, but what would be helpful is a video of the aggression taking place.
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Current setups: 1800 gallon koi pond, 10 gallon planted, 150 gallon reef, other FOWLR tanks
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