Your betta fish has kind of a bubble-like growth on his fin and it just keeps getting bigger What causes it and how do you get rid of it?

The bubble-like growth on your betta fish's fin could be a sign of a condition known as a fin tumor or possibly a parasitic infection such as a cyst or a growth caused by poor water quality. To address it, first, ensure that the water conditions are optimal by regularly changing the water and using a high-quality water conditioner. If the growth continues to worsen, consider consulting a veterinarian who specializes in fish for a proper diagnosis and treatment options, which may include medications or, in some cases, surgical removal.