So, I just found out this morning that my bullfrog, Gnag, has some kind of nematode floating around his tank. They're very small, white, and S shaped and very active, swimming through the current although not very well. However, Gnag is acting completely normal, eating normally, is as plump and fit as ever, and his feces are for the most part firm (and massive,) and I have not specifically seen the worms in any of Gnag's recent feces. I also have not done a 50% water change for about 2 weeks due to the recent vacation I went on. And I believe I may have seen these worms once before when I was keeping them both in the 20 Gallon as froglets and I was in a similar situation with the water changes.

But, I would appreciate some advice on what to do. I've not got a whole lot of money, but I can get Gnag a fecal exam and some Panacur-C as well. I don't want to stress him out, however, and he's eating and acting completely normal. So here's what I plan to do:

1. Do at least 30 90% water changes, stirring up the gravel, and keeping Gnag in a seperate container during this process.

2. Getting a fecal exam done. If it comes up positive, or negative, I will:

A. It turns out positive, so I will continue repeating the large water changes and give Gnag treatment whilst keeping him in his regular tank, as I do not want to stress him out.

B. It if turns out negative, I will keep on doing the large water changes for 2 weeks, every other day.

I am also thinking of picking up some "Parasite Guard". I've heard that it works effectively against parasites in Aquariums. Would this work?

I DO NOT want to clean out the entire tank. I can take out the gravel in the water section, but as for the land/driftwood section I will flush it out repeatedly.