I'm not even sure what these are worm with a fan I'm guessing but regardless of what they are there not helping this piece grow. Time to manually remove them. By the way I dipped these pretty good with no results kinda looks like they can seal there opening.
When outta water they look like this it's the white area circled I basically got a sharp pin and dug the area out, it's a open void once thru skin from there I removed the bug.
All done
