They're both female, we're pretty confident at this point. We got them both around 4 months ago and not a single bristle has appeared.Treat the main tank. If she has something, they all do.
She looks gravid to me but not sure why she’s flashing unless she has a parasite or protozoan. Is the other one a male? If so, try adding a cave for them to breed in
We've been trying to keep an eye out for any visible signs of parasites when she started flashing. Nothing new has been added to the tank for months. It doesn't look like ich, but are there any other signs to look out for?