Thanks for the info... not running any GFO right now and I've waited over 24hrs and after dosing the required ML to go from 0.27 to 0.05 I'm testing at 0.25... I decided to test some RO and got 0.00 no surprise there I tested my coral only tank and got 0.04 so I know thats not confirming my hanna is correct but at least I can tell its not completely off. Maybe I just got a bad bottle of this stuff ??? its not expired...
Last edited: