I switched my mother's to cmh. They were under metal halide before.

I'm getting some purple on the tops of the stems. And on some leaf viens, older leaves are dying and I'm getting some weird yellow on the leaf segments between viens.

3 other mother's are slowly starting to purple up and show the same defects.

I think it may be ph or calcium. But I may be wrong. I usually feed with just water or some organic veg nutes. I haven't had any problems before doing it this way. But the cmh are new to me. The light is about a foot and a half away from the tallest plant. P.s. please ignore the plant that totally fried and the other one who is getting angry at its coco coir. It's currently under a stress test.