what deficiency?

Magnesium?
Check this link and do some more online, lots of it out there. Thsi was closest thing I could find to your pic though. Do you run any CalMg? do u run RO water?
Link: https://www.icmag.com/ic/showthread.php?t=231387

Gets some CalMg on there asap. I use Calimajic by GH. It has some iron in it also. that is what I would do. Maybe with some better experience in this can chime in.
 
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