Quote:
Originally Posted by asylumdown
Also I'm losing faith in my Hannah checker for alk. It keeps telling me I'm over 8, but if you guys think this is low alk, then do I have a testing problem, or are those GFO related issues super temporary? I've never tested it immediately after changing GFO, I always test before I drain for a water change (and thus before I change GFO) so I can get a sense of where my tank is at after 7-10 days of no human intervention.
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Start doing some checking a few hours after changing GFO, a few hours after doing a water change, just before a waterchange, etc. These are good numbers to know about.
As Jack said, it's the fluctuation in alkalinity, not the actual number. Although alkalinity over 8 dKH combined with biopellets can also cause burned tips, RTN, and STN. With biopellets and any other form of carbon dosing (whether you've achieved ULNS or not) you should keep alkalinity between 7-8 dKH if you're keeping SPS.