I don't know what's wrong with my fish...

[Water]

Housing
What size is your tank? I think 1 or 2 gallons.
What temperature is your tank? Not sure, I don't have a thermometer.
Does your tank have a filter? No.
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.

Food
What type of food do you feed your betta fish? Omega One: Betta Buffet.
How often do you feed your betta fish? Twice daily, 2 - 3 pellets.

Maintenance
How often do you perform a water change? Every day.
What percentage of the water do you change when you perform a water change? 25% then after 3 days 100%
What type of additives do you add to the water when you perform a water change? API Stress Coat, Kordon Amquel Plus Ammonia Detoxifier Conditioner

Water Parameters:
Have you tested your water? If so, what are the following parameters?

Ammonia:
Nitrite:
Nitrate:
pH:
Hardness:
Alkalinity:

Symptoms and Treatment
How has your betta fish's appearance changed? It hasn't.
How has your betta fish's behavior changed? He sits at the bottom of the tank and doesn't move for long periods of time.
When did you start noticing the symptoms? Yesterday.
Have you started treating your fish? If so, how? I don't know what's wrong with him, but I changed his water 100% today and plan on doing it again tomorrow.
Does your fish have any history of being ill? He is recovering from fin rot.
How old is your fish (approximately)? Almost 2 months.

Aaaah, I don't know what's wrong with him and he's making me upset because he's upset. He was fine the day before yesterday.. He hasn't been eating. I tried feeding him this morning when I woke up and he wouldn't take it, then when I came home from school I tried again. I think he nipped at one pellet, but then spat it back out... Please help!

[ChoclateBetta]

Sounds like low temp to me.

[sainthogan]

agree, Bettas are tropical and do best in temperatures in the range of 76-82. If you have a heater, even a preset one, and no thermometer, then it's possible that the water is too warm. Please get a thermometer and check the temp - preset heaters have been known to malfunction and end up cooking your fish!

[ChoclateBetta]

Actually 77-83F.

[Water]

Ahhh, okay! thank you. I'll try that and see if he gets any better.

[ChoclateBetta]

Wish him the best buy a heater and thermometer.

[Water]

I already have a heater so I don't think the heater part is a factor to how something is wrong with him. The only thing I'll have to buy is a thermometer to check the temperature..

[ChoclateBetta]

You should keep an eye in the temp for a while when you have the thermometer.