Help identifying

[AiresCosta]

My mother has 10 fish in her tank currently. 9 glowlight tetras and this mystery dude, I'm trying to figure out what he is. He was an accidental fish.
Came in the container when I brought my plecos, so I added him to her tank not knowing whether or not he would survive since I didn't know if they would accept him.
He seems to be grouping with the other glowlight tetras just fine but looks nothing like them. Is he just a young glowlight or another type of tetra?
there's also a photo of my mother's glowlights for reference

 

[Lajos_Detari]

It's a female Guppy.
Guppy is usually quite hardy if there is no disease.

In my country, they put many Guppies into the drains in all over the places to control the mosquitoes.

 

[AiresCosta]

Oh this makes perfect sense thank you!!
I guess we have a baby guppy now

It's a female Guppy.
Guppy is usually quite hardy if there is no disease.

In my country, they put many Guppies into the drains in all over the places to control the mosquitoes.