Join Date: Jun 2010
Location: Northern Virginia
I think you should consider getting a bigger tank in the future. With a bowl this size whether it is filtered or not, you will need to change 100% of the water every other day, or at least every two days in order to keep the harmful ammonia from building up and causing him great harm. It would help you to get a master liquid test kit so that you know from a simple test whether the water needs to be changed--using this kit you can work out a water changing routine, every person with fish should have one of these. Putting a bit of java moss in the tank will also help absorb some of the fish's waste.
Larger tanks are a lot less maintenance, and they can be more safely heated. Bettas in such small tanks often develop neurotic behaviors due to lack of environmental enrichment and many become obese which is one of the leading causes of death for bettas. I suggest you read around for awhile and start saving your money for a better setup, your betta will be so much healthier and more beautiful in a proper tank.