What I This!!??

[Roger Mcfish]

Just noticed these brown spots on a java fern leaf. This plant in my parachromis freidrichstalli tank. He is the only one in the tank.
Is this harmful? Do I dispose of it ASAP?

 

[Hendre]

Those are the fern sorus - reproductive structures to produce spores. No harm

 

[Roger Mcfish]

Those are the fern sorus - reproductive structures to produce spores. No harm

Ok thank you. I got worried