It's been two weeks since I started the Fritz Expel-P treatment. In other words, this is what I did:
Day 0: Took out all decor and added Expel-P to the tank
Day 1: Did a 25% water change, as recommended by Fritz. I also did a gravel vac.
Day 7: Did a 33% water change (incl. gravel vac) and added Expel-P one more time
Day 8: Did a 25% water change (incl. gravel vac)
Tomorrow is day 15, and I'm wondering if I should treat the tank one more time or not. I haven't seen worms on the fish for this past week; however, one of the guppies had some babies, to which I fed baby brine shrimp. A couple of days ago, I thought I saw on a "teen" guppy (not fry) a worm coming out, but I'm very certain it was just poop in the brine shrimp color, as the next morning, it was not there anymore. Usually, the worms stay for quite a while, no? It was the only instance that brought me some uncertainty about whether I should treat one more time or not.
Thoughts?