First I cleaned all filter medias: japanese mats and ceramic rings by rinsing them.
Then I did some rearrangement on these medias. First compartment still japanese mats, 2nd compartments with ceramic rings, and some plants on top, and third compartment with japanese mats again. Might change the third compartment with ceramic rings in future.
Total water change should be around 30% - 40%. Added black water to calm Kelesa.
pH after 3 hours is around 6.37. Might add in 1kg of coral chips tomorrow if pH drops further.
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