While doing a water change today I noticed a large lump on my fish's side. It has been there for a few days, but he is prone to bloating so I didn't think much of it. However it is much larger today. Over the past few days I've been feeding him 3 pellets over the course of the day, hoping it would go down.
He is surfacing frequently for air, and seems to be having more trouble than usual doing it. At this point I'm thinking 1 tbs epsom salts predissolved as I know they will not damage my plants.
What size is your tank? 2.5 g
What temperature is your tank? 80F
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? N/A
What type of food do you feed your betta fish? Omega One Betta Buffet
How often do you feed your betta fish? 2x per day, 2 pellets each time
How often do you perform a water change? Every week or 1 1/2 weeks
What percentage of the water do you change when you perform a water change? 75%
What type of additives do you add to the water when you perform a water change? Prime
Have you tested your water? No
Symptoms and Treatment
How has your betta fish's appearance changed? Large lump has been growing on his left side stomach area
How has your betta fish's behavior changed? Struggles to swim to surface, surfaces frequently for air. Also lists slightly to the side.
When did you start noticing the symptoms? 2-3 days ago
Have you started treating your fish? If so, how? I have not
Does your fish have any history of being ill? Fin rot when I first got him, bloating problems earlier this year
How old is your fish (approximately)? ~3 years
Is it possible this could be a tumor or something internal? I am hoping it is bloat or SBD...