I think it's really great when anyone does what they can to save an animal. There are so many little homeless guys out there and I think if everyone had your attitude, animals would live in a kinder world. It's nice to see that you're worried about taking proper care. Many people just want something but don't look to the future of how they'll take care of it. I would love to rescue more animals myself, but I'm doing what I can right now and I have to feel good about that. I have 3 rescued cats, a dog, and 2 bettas, in an apartment. They all have just enough space and since I want to feed them with the best food I can buy and provide proper vet care, I've drawn the line here.
Cheers on your new little betta friend!! We'd all love to see pics!