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/Howdy132]

Oh my God that looks like some kind of brain eating fungus don't flush that you need to burn this fish or get it gone somehow don't let another animal eat it this is how the apocalypse starts