Can someone tell me what this mystery plant (weed) in my aquarium is?

[Richee]

This thing popped up out of no where , and I kinda like it , but have no idea what it is . It reminds me of some sort of weed but I like the look of it .

 

[Richee]

Alright after some research I’m thinking this is “guppy grass” am I correct ?

 

[GaryE]

That's the trade name for it where I live. It should be Najas guadalupensis. It's a great plant.

 

[CassCats]

Good fast growing plant, can be a beast.

 

[fishorama]

Often a little to "happy" & needs control IMO

 

[connorlindeman]

Yup. Thats guppy grass. Pretty cool plant.