I bought some plants today at a LFS a couple of hours away from my city. I just got home and noticed through the bag there was a really long and thin worm wriggling around in the bottom, tangled in the roots of a vallisneria. This this was LONG and really elastic like, and the colour was blood red. It broke into sections when I tried removing it, and one of the sections burrowed down into the leaves of the Val. I cut that leaf off and scooped it out. What the heck is this thing and should I not use the plants I bought from the store?? I had a huge bag of vals, I'd rather not waste them. Help!