New Bettas

I haven't had too much luck with bettas lately and I can't believe this happenned to me again with another heater. I accidentally must have hit the knob on the heater when feeding my betta in the morning a few days back. I didn't realize it and when I came home the temp went up and the betta died so upsetting I had just bought Spumoni 2 months ago when I lost another betta to a heater accident and to have another heater mishap really pissed me off. Then for unknown causes my betta Oscar died have no idea why. A few weeks back he had popeye I cured it with Maracyn and he was back to normal in days. Then a few weeks later he was lying in his cave alot but his water was fine ph 7.0 nitrate 5 nitrite 0 ammonia 0. He started staying up at the top even after a wc was done I figured he must have something internal or it is possibly old age he died Friday night. I bought two new bettas and am crossing my fingers. I am in the process of replacing the heaters in my smaller tanks I have not had a chance to purchase them yet but will very soon. Here are pics of CASPER AND SAKI

Thanks! I feel really guilty about losing Spumoni because I had lost the betta before I got him by a heater accident I fell asleep forgetting I had turned it on and then another accident by hitting the knob and now Spumoni died is just sad because he was so pretty! Am going to be much more careful. Yeah Casper is my first white betta was going around and around thinking of names then I thought of cartoons with white characters and Casper was it! Thanks for the kind thoughts sorry for your losses too SMDIMI.

OK will post.