To be honest, you probably don't need anything to re start your cycle. All the die off in your rocks will start the cycle. Your rock was once cured/cycled So now it's just going to have to go thru the process again.
Plus, since you didn't do anything to your sand, it's full of the bene bacteria you need anyway. No need for any bottled bacteria. Just ghost feed the tank and let it run its course. Check your levels in a few weeks and don't add anything at this point until after 72 total days. Anything wet.
You can use the bottled bacteria for your QT tank in which you should read up on how to properly treat fish prophylactically for certain things, and then keep them in your qt for a 4-5 weeks for observation and retreat if needed. By the time the whole QT process is done, you're half way done with leaving the tank fallow. Once it's done being fallow, your healthy fish can go in
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