Wow - I have to thank you so much for going this much in depth to help me. I really, truly appreciate it. I think this may be the most helpful, friendliest forum I've been on in a while
I guess we never really had the resources for the Betta we had when I was younger. They always sold them at Meijers or something in little tiny plastic containers, so we just put them in a medium-sized fishbowl without any heater, because we didn't realize that they needed it. I guess that's why they never seemed to live very long in our family.
I do love them, and I wouldn't mind just having one since they are so colorful. I think I'll go with a Betta. I'm making a careful note of all the information you've given me, and I think I might finally be able to get a good fish that will live for awhile