My betta fish has had a rather large lump on his side for the past couple of months. It just kept growing. Now within 3 weeks, another one has popped up (the one closest to his face). I can tell the lumps weigh him down because he swims slightly weighted on his side. He is still eating and swimming, but does spend a lot of time in one spot. Are these tumors? What's odd, if I feel like they sprouted up when I moved him from my living room to my bedroom. The only difference being is it's dark in my bedroom all day. These lumps couldn't possibly be from a lack of light, could they? His tank is heated between 76 and 82 always.
Thanks for any help or insight! I'm hoping he isn't in pain or suffering.