Rox 0.8 carbon and corals

It's definitely possible and has happened to me more than once. I have a net water volume of around 110 gallons and using .25 cups of ROX carbon after using none for a while will result in STN. Usually just burnt tips. I'd recommend about 1/8 cup of ROX to start with your water volume. Then after a month of that, slowly bump it up.
 
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