bleach doesn't need to be in a very concentrated solution to be effective, it doesnt need to be stronger than 5% to destroy bacteria, virii, even small invertebrates (eg mites) - and yes I agree, get into the corners and make sure it really is clean
I do agree that you should not mix boiling water and bleach into a solution for sure, but a mix of hot water and bleach is important, finished off with a close to boiling (65C+) clean rinse. If the bleach solution is cold, you risk cracking the glass with the final rinse at high tempreture - rinsing with cold water wont give you the heat treatment you need
I've used simple bleach then boiling water rinse method on countless tanks, some which I've had for decades, with no issues whatsoever
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