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I used to keep a breeding group of maingano (M. Cyaneorhabdos). These were my observations:
Both sexes will display dominance by twitching.
Both sexes will dig.
Dominant females can have very vibrant coloration.
Dominant females can be very aggressive - especially towards females lower in the pecking order or smaller subdominant males.
Both sexes can exhibit territorial behavior.
Females become sexually mature at about 2", males at about 2.25" - 2.5"

Aside from venting or observing eggs/spawning behavior, there really is no good way to distinguish between sexes. I had quite a few from my group that fooled me.
 
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