Hi, me again.
I thought I'd share with you how I sterilized my tank since we had the same little tragedy, the same sterilization process should be fine.
I filled up the tank with 20 parts scalding hot water, and 1 part bleach (put the water in first, then add the bleach). I left it sit for 30 minutes - make sure the liquid goes completely to the top to sterilize everything. Then I dumped it out and rinsed it thoroughly with super hot water. Then I squirted Start Right (or whatever dechlorinator you use) all over it. and I mean ALL over it. Then I rinsed it again.
THEN... i turned on my shower as hot as it would go and set it in the shower to rinse for a good 30 minutes. That was last night.
Today I have little Charlie in the tank.
I'm so glad that you're not letting your loss stop you from getting another betta.
Each experience you have with them will be one more piece of knowledge you can file away and make sure to remember for the future,and then share with others.
I hope you're feeling better.