I recently bought my first Betta fish and I am very unexperienced. He was living in a small bowl for about 2 weeks with no filtration or heater (the lady at the pet store told me this was ok) then, I learned how cruel it is and got him a 5.5 gallon tank with a heater and filter. However, on his last day in the bowl I noticed a hole in his tail and I don't know what to do. I thought that transferring him to the bigger tank would heal it. He is swimming around and acting normal. I don't know how to help him, and I don't have very much money to spend on him. Did I make him sick by keeping him in the bowl for too long? :-( Please help!