Is your water as clean as should be? I went and brought the Milwaukee MW500 PRO ORP Meter. Using the Anoxic Filtration System, four BCB bags started on Jan. 13, 2022.
They are mature and running in my sump. Check the video proof is in the pudding, as they say: https://youtu.be/yAnLcvTaTj8
The reading of 236mv is within the range for freshwater tanks (150mv-250mv).