I know bettas can go awhile without food, but what worries me is my little guy Dawson is not rounded at the tummy at all, and seems quite thin if you look at him from above. He is young though. I brought him home from Walmart, where he's been for a few weeks - (scary). I got him early yesterday and took him home to a ready tank and got him used to it gently. He seems healthy otherwise.
I waited till just before bed when I feed my other betta, Clementine and tried a soaked Omega One Buffet pellet. He latched on, got it in and then within 30 seconds it was right back out. I tried it with 2 more. This morning I tried a blood worm and an Aqueon pellet. Same. Not sure if he's trying to get used to his surroundings or? I have the fishy glass stones in the bottom and he keeps trying to go after the fallen food, but it just keeps coming back up. Makes me feel bad for my new friend.

Is this just a waiting game or should I be doing more?
Housing
What size is your tank? 2.5 Gallon
What temperature is your tank? 80
Does your tank have a filter? Yes, Carbon
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 Pellets
How often do you feed your betta fish? for him (if he'd eat) 2 pellets, 2x day because he is small yet.
Maintenance
How often do you perform a water change? Twice weekly, 100% and 50%
What type of additives do you add to the water when you perform a water change? Prime
Water Parameters:
Have you tested your water? If so, what are the following parameters?
Ammonia: 0
Nitrite: 0
Nitrate: 0
pH: 7
Hardness: 25
Alkalinity: 100
Symptoms and Treatment
He seems fine, not even ferociously hungry, but is going after food - just not striking at it. When he gets the soaked pellet, he spits it out. I have tried a few different kids of food I have.
Does your fish have any history of being ill? None known
How old is your fish (approximately) Not sure, he looks young and has his color. He's a beautiful crown tail I've been looking at at Walmart, and was 1 of 3 survivors of the last shipment they had. My guess 5-6 months + ???