Betta Fish: Betta Fins okay?

I got my betta around 2-3 months ago, I rescued him from the pet store where all the other bettas around him were dying. I cycled the tank, fish in, because I am new to fish keeping.

I’ve seen other bettas online with big full round fins and his are kind of jagged now. I’m posting on here to see if this is normal or if not what I need to do to get him to be his healthiest self. He seems happy, he eats, swims around, makes bubbles, tank parameters are good, etc.

The first photo is today and the second photo was about two months ago.

• ⁠Tank size: 5.5 gallons

• ⁠Heater and filter? (yes/no): yes and yes

• ⁠Tank temperature: 78°F

• ⁠Parameters in numbers and how you got them: free chlorine=0, nitrate=0-10 ppm, nitrite=0, hardness=50-125 ppm, total alkalinity=120-180 ppm, pH=7.6-7.8, sodium chloride=0, ammonia=0. I use aquarium water-8 test strips.

• ⁠How long have you had the tank? How long have you had your fish?: tank and fish both around 2-3 months

• ⁠How often are water changes? How much do you take out per change? What is your process?: 25%, once every week, use a siphon

• ⁠Any tankmates? If so, please list with how many of each: none

• ⁠What do you feed and how much: Biogold about 8 pellets a day, sometimes daphnia

• ⁠Decorations and plants in the tank: two Anubias, one banana plant, four marimo moss balls, a hideout cave, and also a fake driftwood (aquarium safe).

• ⁠If you haven't already posted a picture, please post pics/vids to imgur and paste the link here: pictures above.