Speaking of nematodes, I think my fish has some sort of internal parasite. Not to hi-jack your thread, but I wanted to get more hands on info about the different nematodes. I've researched and read, but I find it easier when someone has dealt with them hands on. I had this problem about a month ago about my fish acting strangely, and I had a feeling it may have been internal parasites, but no signs...until I started seeing the white poo. I started treating the tank with parasite guard because it had metronidazole.
Long story short, my fish's appetite is gone and after treating for 2 weeks, I've noticed a lot of white worms "nematodes?" floating in the water...they look dead. They are not planaria, I know what planaria looks like. Everytime I do water changes it just comes back. What should I be using to treat this?