I am thinking this is coloration, not illness. The fish looks healthy. But, she would show other indications if ill- changes in behavior: not eating, weakness, hiding.
Or, white feces, red worms from vent?
Noticed any of these behavioral changes or issues?
I haven't noticed anything like that but I will keep a close eye on her.
She's displaying the usual characteristics of a healthy betta. Wandering around, keeping active. However now another betta has me concerned. He did have fin rot and I did a salt bath for 10 consecutive days. A few days ago he started listing about, sometimes floating a little upward or downward, so I assumed he had swim bladder disease and didn't feed him for two days. However, he's been lethargic and hiding. He isn't a new betta and it's an established tank, so should I forego the Artemiss and Herbtana and just resume the salt baths again? I gave his tank a large water change.
Update: Annnddd now she has cloudy eye. Just in the one eye, possibly from stress (can't see how she could have from injury). The eye itself isn't bulging any way different than usual but the pupil itself is completely clouded over. I did a rather large water change.'
So far I've read epsom salt for popeye and aquarium salt for cloudy eye; still reading, just want to make sure I do the most appropriate action. Is this correct? 1 tablespoon per 5 gallon of aquarium salt with the water change?
If I just did a water change, can I dissolve the salt in a separate container and then add it to the tank?
Update: Did an aquarium salt bath.
No change yet. It looks like both her eyeball and pupil are cloudy in the pictures, but in reality only the pupil is.