I am so sorry to hear about your last betta, and all the other little fighters.
Please tell me how you cleaned the bowls and equipment. If you used soap, then you can't put fish in that. Soap is deadly - too many phosphates. Usually just elbow grease is the way to go. But if you used soap, we can try a vinegar baking soda combo to fix that up.
Yes, 75 F is good for bettas, but warmer is even better. More like 78-82 F. Sorry I don't know C conversions!
You can go with goldfish, but they are much more difficult. For one, you can't keep them in a bowl. Two, you need a power filter and a really big tank, which all costs a bit more than betta's minimal needs do. But certainly check out my goldfish articles if you wish to go theat route.
Anyway, let's see how to get your next bettas up and happy. So don't buy any fish yet, and tell me how you cleaned the bowls, and how big they each are.
