My betta, Mr. Chauncey Huffcat, is not doing so well. He has always been small and runty, and finicky as heck, but this is different. lately he always seems to be constipated (poo hanging for long periods), lethargic and spends a lot of time lying on the bottom of the tank, not normal for him. He never builds bubble nests anymore. I actually thought he was dead two weeks ago, but then he started swimming around.
He lives in a 2 gallon tank with a few rocks and a silk plant. It has a little heater and stays between 78-80 degrees F. I feed him Hikari Betta Bio-Gold, soaked, two pellets a day, 5 days a week. Then he fasts one day and is fed peas the following day. Occasionally he gets bloodworms as a treat but it has been at least 8 weeks since he has had any. There is no filter so I change 100% of the water, scrub the rocks, plants and tank every 3 days, filling with temp and ph matched water. I condition with Prime and there are no other additives/meds. His fins and scales and appearance all seem normal.
I tried fasting him for 3 days and then feeding peas but he is still constipated. I have been feeding him peas exclusively for the last 5 days and no change. The ph has not changed in my tap water, and once when I waited 4 days to change his water the ammonia was still not measurable on the test, so it should not be a water quality issue.
I have been doing everything the same for a little over a year, I have racked my brain to think if I have made any changes...but I cannot think of anything. Could he just be getting old? I know bettas don;t live too long, but I thought it was like 2-3 years and I have only had him for 1.
Any advice?