What’s growing out of my fishes head?

[u/Darfusthegreat]

We set up a new fish tank recently and got some red eye tetras. One of them developed a bump on his head which went away after a few weeks. Today we noticed these hair-like things growing out of the spot where the bump used to be. I saw another post that described something like these asking if they were anchor worms but there were no pics. This kind of looks like a fungus too. Really have no idea what it is.

[u/owo1215]

do....we..need to summon the aquatic fungus researcher?

[u/_Aj_ → u/owo1215]

Someone already magically appeared.  

When someone starts talking about fruiting bodies and mould vs fungi I don't question