It's always best to go with white vinegar if you can. But, if you really need to disinfect, use a diluted bleach solution (bleach and water) and rinse it a bunch of times. Then rinse it with conditioned water a few times.
I just got a used reptile tank too. I'm going to go with vinegar, but that's just because it's a super heavy 55 gallon which would make it really hard for me rinse out well if I had used bleach. I still plan on rinsing, just not nearly as rigorously. Otherwise I would vote for the bleach.
A concentrated water conditioner like prime can also be used to make the tank safe if you need it in use sooner (a helpful tidbit for disinfecting QT tanks).
Oh when you said "bleach reacts with light" i read light as sunlight lol... so you were saying just leave it in an open/well ventilated area for 2-3 days? And extra prime to be safe...
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