an update, and a lil offtopic, but someone might need it:
Yesterday I did a massage to my ropefish, 4-5 times, from her ass up to her mouth, to release her from gass if that was the problem.
today she is surprisingly much better! still having trouble swimming normally, waddeling a bit from side to side, but she can dive and lie on the bottom.
about my worms problem - it appears to me that, luckily, those are not the worms after all, maybe just some scales edge scath