Sorry to hear about Puff Puff
. Yes, bettas are great pets, but I feel that I should mention one thing that no one seems to have mentioned yet. Please cycle the tank before you go out and get a betta. So many bettas die because they are placed in uncycled tanks, that it is really sad. If you don't know how to do a fishless cycle, just google it and read all about it. Otherwise you will have to do water changes like every few days. If you are ok with that go ahead, but if you don't want to do as many water changes cycling the tank is a good idea. I am glad that you are trying to give your new fish a good home, one thing is make sure you buy him from a good place. Many pet store bettas are already sick, and that would definitely not be a good experience if you get a betta only to have it die of a disease in a few days. Good luck!