R u dosing any calcium additives in the first place? U have to stop dosing and wait for it to drop to normal levels, u can cont'd with water change. Mg is magnesium.
Your ca too high, try to bring down to between 400-500ppm range, KH is ur alkalinity or carbonate hardness. Mg is suppose to be between 1200-1500mg/l. How come urs is only 0.5mg/l?
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Ok, it will take some time to grow coraline algae. In the meantime, make sure ur water para such as ca, kh & mg r stable to induce their growth as well as for ur sps to grow.