I've never seen that before!! Was it likely something that it hitched a ride in with some plant or may have been already growing in the fish at purchase??? How long does the worm live in the fish before showing signs?
This parasite has been around for a very long time,
the main place it's been coming from as I have heard, read, is from fish that's been imported in, (it can be transferred from one tank to another with a simple drop of water, so do the math, if a simple drop will do it what won't,
Over the next few yrs I've heard it's going to be increasing in numbers, Which I have already seen happen around here, in just the past 6 months seems everyones crying over getting it. and most every case is traced back to the fish stores.
The parasite can live 6 months before even showing itself, if it ever does,
They say those mysterious deaths are often linked to this parasite,
I know some people swear that nearly every fish you purchase from a pet store has come in contact with this parasite and thats a big reason why they die.
I know since I purchased Leviscole" and treat any new fish I purchase, The deaths are almost none existence.
Everytime I have run into the parasite has been Fish I purchased from a pet store, or from someone who got frustrated with their fish dying and gave them to me to only find out after treatment they did great.