I got a few questions before answering... first, what is your tank size? is there any other inhabitants aside from guppy and mollies? are you sure that it is female? pic would help a lot. when you bought it, is there any males at all? coz six months is a bit too long, that is if you bought it when it's still a fry.
Well, I experience this kind of problem before... only to find out that I got a late bloomer male, at first glance it looks female but later on it turned out to be a huge male.
yes, sometimes they tend to be aggressive towards the other, especially towards the other male.
I wont suggest anything, aside from observing it carefully. If it looks pretty bad then send back the newly bought to the LPS.
Hope that this help...
Thanks,
Ronn
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