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I removed some rocks that are caked in diatoms, and in the crevices of the rocs, so not that easy to scrub of - would soaking it in Hydrogen Peroxide or Bleach guarantee a complete removal?

Thanks
 

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Well, bleach will kill it. Make sure to soak overnight in a bucket with a double dose of Prime before returning them to the tank though.

You'll probably still want to take a stiff brush to the dead diatoms though to manually remove them, as they might be dead but they won't necessarily fall off on their own.
 

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Agreed^^.

Bleach will definitely kill it, but also, well, bleach it. If it's calcareous rock, consider instead doing an acid bath with muriatic acid instead. Far more effective in my opinion. The only issue is that it's also far more dangerous....

You're probably going to have to take a stiff brush (think something you might use for dishes with bristles) to it anyways.
 

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Throw them in the dishwasher and run it a few times using vinegar instead of soap (turn off the prewash feature if your dishwasher has it). This should also clean the deposits out of your dish washer for a win, win!
 
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