mollie behavior?

Apr 6, 2003
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i have 2f dalmation mollies, one had fry 30 days ago and very, very pregnant just now. The other female was a good bit smaller than the other when i got her just under 2 months ago, and she hadn't had fry nor has she had any even though i also had a male who died after a couple of weeks. Anyway, i've noticed the small female kiss/nibble at the others anal fin area like the male used to. The guy in my lfs said she will turn in to a male since she hasn't had any babies. But in the last 2 days i've noticed the little one kinda slap or wiggle its tail right against the other ones face? it does'nt seem to bother the big female but i just wondered why. Anybody know why?
Thanks