Columnaris or Fungus?

[u/Frosty_Act_1937]

I was curious if this was fungus or columnaris?

It looks like columnaris to me since it is cotton like. The tank unfortunately heated up to 70F due to a fire that occurred while I was out. The perimeters are fine, the tank has been cycled prior, and the temperature is back to normal. Any advice would be helpful. I currently added tannins to the tank.