Molly or Platy??

[eduh]

Guys,

I have 2 questions:

1. I got these fishes 3 weeks ago, and I remember the LFS saying Molly.

However, I was found some research about mates and I saw they look similar to Platy.

I will add some pictures below, what do you think?

2. One of these fish like to swim fast against the other, like following them. I don’t know if she is having an aggressive behaviour or just play around lol.

I haven’t seen she nipping their fins, but maybe because they escape from her.

6 fishes:

 

[SaraB]

The first 2 and last one are mollies and the other ones in the middle are platys.

 

[eduh]

The first 2 and last one are mollies and the other ones in the middle are platys.

Thank you!

Any comment on the behaviour?

It’s one of my mollys.

 

[SaraB]

Well considering that all your mollies look female we can rule out breeding behavior. I think it's just minor fighting over who gets to be top fish in the tank.