Aaaand the little parasites are back. On both bettas. It seemed like for a few weeks they were gone but I noticed them today. They're the size they were before on the female, and they look a little smaller/younger on the male. I had to use a magnifying glass to get a better look, but they're still so small that I can't tell if they have forked tails like anchor worms or not. I just noticed yesterday that the male's fin rot is back, so I wonder if this is at all connected.
Guess it's back to medicating--for fin rot AND parasites.
On an interesting note, they never seem to really bother the female. Her health never declines, she doesn't scratch on anything, or act at all peculiar. I wonder if it's because she's a dragonscale, maybe her scales are too thick for them?