Please see attached pictures. I'm not sure if she's egg bound, dropsy, or some other mystery. Acting healthy aside from mild swimming issues, namely staying level.
What size is your tank? Half Gallon (Marina Betta Kit with live plant)
What temperature is your tank? Low to mid 70s (guessing)
Does your tank have a filter? No
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? By herself (male in another tank and more often than not there is something in between them so they can't see each other)
What type of food do you feed your betta fish? HBH Betta Bites - pellets
How often do you feed your betta fish? 3-4 pellets twice a day 5 days a week
How often do you perform a water change? usually 2 times a week
What percentage of the water do you change when you perform a water change? full
What type of additives do you add to the water when you perform a water change? 1 tsp aquarium salt and 10 drops tap water neutralizer
Have you tested your water? No
If so, what are the following parameters?
Symptoms and Treatment
How has your betta fish's appearance changed? She's all bloated with a weird white/yellow bubble from her anal area.
How has your betta fish's behavior changed? It hasn't. She still eats the same, she still swims but gets frustrated because she can't swim as well
When did you start noticing the symptoms? About this time last week.
Have you started treating your fish? If so, how? 2 drops of MelaFix
Does your fish have any history of being ill? Nope she's always seemed healthy
How old is your fish (approximately)? I got her about 9 months ago from PetsMart