So I don't use bioballs so I can't speak for if your problem is the same overall root cause or not. I run a sulfur denitrantor and it consumes ALK at an unbalanced rate to the amount of Calcium added with Kalk. I only use Kalk for calcium addition today, and evently I'll get calcium to 500 and ALK to 7. Once this happens I just use seachem reef builder in place of my Kalk solution and boost only ALK while not adding calcium...
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