I messed up somehow setting up a recirculating CO2 scrubber. The media got wet and water flowed into the tank from the reactor. pH shot up to 8.79 and took about 8 hours to return to a normal level. Alkalinity also rose from 8.5 to 10.4. 12 hours later it's dropped to 10.0. Thus far I see no immediate issues with the tank but added ROX GAC due to concerns about the pink color changing CO2. It didn't appear to lose it's color so I don't know if any "chemicals" washed off of it, or if they could be harmful if they did.