Male or female?

[BigBurgassio]

I think this is a female guppy, initially thought it was male then noticed it getting chased a lot by male endlers.

 

[Colin_T]

It's male as identified by the long thin anal (bottom) fin (called a gonopodium).
Females have a fan or triangle shaped anal fin.

If you post a video of the Endler's chasing it, that might offer more information.
Upload videos to YouTube, then copy & paste the link here.
If you use a mobile phone to film the fish, hold the phone horizontally (landscape mode) so the footage fills the entire screen and doesn't have black bars on either end.

 

[BigBurgassio]

Thanks, I actually moved it into a different tank as I didn't want anymore breeding, he's in the 60L with Betta and another guppy that is definetly male but that fish doesn't bother it.

 

[emeraldking]

The male endler probably thought that this male guppy was a female. This guppy seems to be a late male.

 

[BigBurgassio]

The male endler probably thought that this male guppy was a female. This guppy seems to be a late male.

I think so yes there was a group of about 3 or 4 males endlers that chased and hassled it the whole time, must have been stressful for the guppy so that's why I ported him in along with the betta, thankfully the betta pays no attention to the guppies, 60 litre as well so plenty of space.

 

[Naughts]

The male endler probably thought that this male guppy was a female. This guppy seems to be a late male.

Or they knew deep down that it was a male but still chased the nearest thing to a female they could find, just in case!
Mine did the same.
Randy little sods .