From a Google image search of the nematodes, it appears that we may
have those creatures. Although some websites state that they only
reach 5mm long, I know we have longer ones upwards to 10mm. It's
really tough to compare my "worms" with those images from Google since
I don't have my portable electron microscope hooked up yet. :-) I
think I'm still going to get my turtles on a diet/fast for a few days
and see what happens.

Thanks for all the comments and info!