Changing Yellow

This Shishkaberry has leaves that are changing to a yellow-tinge. It’s been watered with ph-balanced water every-other day and the past 2 waterings Cal-Mag was added. Since the Cal-Mag, the yellowing changed faster. Too much Cal-Mag? Notice the tips of the leaves are changing yellow, and the ones on top are already a yellow-light green.
1200W full spectrum COB light is being used. 24-hour light cycle.
Any help appreciated!

Hello,
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Kind regards,
Joe

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