I have been keeping the lights off since this started happening cause I thought it would stress him out. I only turned on that light to take the photo. (I immediately turned it off again). He's flaring at the moment at the front of the tank and pacing around his plant. I don't know what he does when I turn off the main light (the light to my room). His water is at 76 degrees and I've been keeping the room rather quiet for him.
Unfortunately, he is in a 2 gallon in the meantime. I have a 5 gallon open for him in December once my baby fancy goldfish (two of them. They are super duper small and adorable) move to a 38 gallon that shall be there at that time. ((and once it's cycled)). I am debating on moving him to my quarantine tank which is 2.5 gallons and trying to set up the filter there.
Probably. I'll move him to a larger tank as soon as possible. I've also observed that he gets stressed when I'm near the tank. So, I'm trying to be away from the tank until I have to. (Feeding and water changes.)
I moved him into a highly planted 2.5 gallon for now and I have realized that he has fin rot. One of my friends came over to look at the fish and agreed with me. (She has 4 betta fish in her care, all in 5-10 gallon tanks).