My betta is acting neuotic

[Sparkette]

Housing
What size is your tank? 2.5g Planted
What temperature is your tank? 78F
Does your tank have a filter? Yes
Does your tank have an air stone or other type of aeration? No
Is your tank heated? No
What tank mates does your betta fish live with? None

Food
What type of food do you feed your betta fish? Hikari Betta Bio-Gold
How often do you feed your betta fish? 1 pellet 2x Daily

Maintenance
How often do you perform a water change? Bi-weekly
What percentage of the water do you change when you perform a water change? 25%
What type of additives do you add to the water when you perform a water change? Nutra Fin Betta Plus / Nutra Fin Betta Enviro-Clean

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

Ammonia: 0ppm
Nitrite: 0ppm
Nitrate: 0ppm
pH: 7.6
Hardness: n/a
Alkalinity: n/a

Symptoms and Treatment
How has your betta fish's appearance changed? He started nipping his fins

How has your betta fish's behavior changed? Fin nipping, aggression, erratic swimming, flareing.

When did you start noticing the symptoms? Past 3 weeks

Have you started treating your fish? If so, how? N/A

Does your fish have any history of being ill? No

How old is your fish (approximately)? In the past two months he has become an adult.




In the past 3 weeks my betta has started to become more and more aggressive and neurotic. Im sure if he is just a very aggressive fish or is he is sick. Any help would be greatly appreciated.

[babystarz]

What does he have with him inside his tank? Also, where is the tank located in your house?

[Sparkette]

Here see the picture below same plants except I got rid of the crypt plants. And he is in a south-west facing window.

[Sparkette]

I swear, he's not going to have a tail fin left in a few days. Now he started to attack the glass anytime someone comes near him and he practically jumps out of the water when you feed him.