My betta, Capote, has not been herself since last week. I was unexpectedly away for a few days, and her one gallon tank was pretty yucky when I got back. Her color was also dulled. I've been doing daily water changes for the past 5 days or so, and her color has improved..... In fact, I can see darker blue stripes now (that she had when she was younger, too. I'd see them sometimes when shed blow bubble nests, maybe a little "eggy")
HOWEVER, she has been more lethargic than normal and not interested in food. Yesterday when I was stuck at my desk, I moved her tank over to the desk for a change of scenery, and that did perk her up a little, but not as much as it used to.
I DID, in a pinch, have to switch to an API product as a water de-chlorination (to make tap water safe) from an Aqueon product, which I had been using since she was a fry (she's about 7 months old.) tank temp is in the high 70s.
I do have some dried blood worm that I could try, but she's never eaten them or shown interest in them previously.