Pregnant Or Poorly Molly?

[drewwhitley]

Hi folkes,

I have a black Molly in a mixed community tank and last day or so its behaviour has changed.

We have 3 mollies in total, and I think the other 2 are male. Yesterday the black one stared to behave aggresively towards the other 2 mollies, chasing them out of her half of the tank.
All the parameters are good, 0,0,20 and its a 125l tank.

The black molly has also got a noticable white dot near its anus and anal fin, this seems like a protrusion from the fish itself and seems a little more rounded than a day or so ago.

Any advice welcomed!

 

[Cazgar]

It sounds like she's getting ready to give birth, they often get aggressive to other fish when they've decided on a place in the tank to drop their fry.
That white dot by her anal fin is the birthing tube