The picture shows that the coral tissue is thick, which is probably speculated to have a PO4 measurable value, or the light source is insufficient or not suitable for more white light. The coral in the picture is not fully grown, most of the coral is healthy, and the CV is temporarily stopped. AA, and other nutritional supplements, this should be no problem. At this stage you should try to reduce the nutrient salt. Obtain NP test package
Try to explore the first stage of Kz, I believe that both coral and Cyanobacteria can help positively.
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