Well, again I decided to change the arrangement of the filter medias. This time I put a layer of japanese mat at the bottom of second sump compartment, follow by sponge and the rest are the bio/ ceramic rings. At the third compartment, also at the bottom are two layers of japanese mats. On top of the mats are 5-6kg of coral chips as pH buffers as the pH these days quite stable around 6.4 and drops further over time. So hope to keep the pH stable from now on within the range of 6.4 - 6.8 if possible.com
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