Well, I've been wanting a betta fish for some time, and on a whim I asked my dad to put money into my account, and my friend I drove out to Petsmart and bought my fish and what not last Friday.

On the second-third day I noticed he had chunks of his tail missing. I thought it was due to stress since he was getting used to a new environment. To me the confusing thing was he was still making bubble nests, so I thought he was happy? Well now I keep seeing him chase his tail, and today I noticed his tail has just gotten worse.
A few Days Ago:
Today:
I'll admit, he's in a one gallon tank, with one silk plant (he had a plastic before tonight) and a tiny pagoda.
I don't quite have enough money for a new tank yet (after researching, I realize my mistake of having a "small bowl"). So I was hoping of getting him a 2-4 gallon tank or bowl. I can't have something too huge for him since I live in a dorm room. Hopefully in the future I can look into a heater and a filter if need be.
I just want to keep Mage alive for as long as possible. Please help. D: