I'm not sure what I should be doing. Here's some information.
What size is your tank? 5 gallons.
What temperature is your tank? 79-80 degrees.
Does your tank have a filter? Yes.
Does your tank have an air stone or other type of aeration? No.
Is your tank heated? Yes.
What tank mates does your betta fish live with? None.
What type of food do you feed your betta fish?
Normally, wardley's advanced nutrition and new life spectrum- small fish formula. Sometimes he also gets frozen blood worms and brine shrimp.
How often do you feed your betta fish?
Every day except monday(his fasting day) and then twice a day. I usually feed him 2-3 pellets of the wardley's in the morning and then a tiny pinch of the new life spectrum stuff in the evening.
How often do you perform a water change? Once, weekly.
What percentage of the water do you change when you perform a water change? Usually about 50%.
What type of additives do you add to the water when you perform a water change? API stress zyme and stress coat.
Have you tested your water? If so, what are the following parameters?
I have not.
Symptoms and Treatment
How has your betta fish's appearance changed? Round, bloated stomach.
How has your betta fish's behavior changed? It has not, he still eats and is still active, he even still blows bubble nests.
When did you start noticing the symptoms? About 2 weeks ago.
Have you started treating your fish? If so, how? I tried fasting him for about 3-4days, and since then I've been feeding him frozen daphnia 1-2 times a day.
Does your fish have any history of being ill? He's a tail biter, but he's never been bloated.
How old is your fish (approximately)? A little over a year.