Yes I agree with the others, looks like Columnaris.
And Agree with tlindsey, if you had this disease (duck lips) previously, you need to totally break down and disinfect the tank before any other fish were added, outside and in, its rim, and everything that came in contact with the water, nets, substrate, plastic tubing, ...... everything..... as thoroughly as if it were Covid.
The bacteria, (its cysts) that cause columnaris can live ( dormant) in a dry spec, or smudge of dirt, or evapoarted calcium stain, and reinfect when and whatever comes in contact with that water.
If it were me, I'd toss old substrate, maybe even filter media "unless" I could submerge it for a week in a bucket of bleach.
