Originally Posted by Aus
Keeping his water clean is a good move.
It'll help if you fill out the questionnaire sticky at the top of the diseases forum, then we'll better know how to help you.
Are there any other problems with him like appetite loss, etc? Is he swimming okay?
What size is your tank? 10 gal
What temperature is your tank? 80
Does your tank have a filter? Yes
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 as far as I can see
What type of food do you feed your betta fish? Pellets
How often do you feed your betta fish? once a day
How often do you perform a water change? 50% every week, 100% every month (Varys)
What percentage of the water do you change when you perform a water change? 30-100%
What type of additives do you add to the water when you perform a water change? Water purifier or something
Have you tested your water? If so, what are the following parameters?
Ammonia: I can't test right now, Too late at night
Symptoms and Treatment
How has your betta fish's appearance changed? A bump
How has your betta fish's behavior changed? A little wabbly, and hard to swim some times
When did you start noticing the symptoms? 3 days (Approx)
Have you started treating your fish? If so, how? Water changes
Does your fish have any history of being ill? Nope
How old is your fish (approximately)? I've had him for approx a year