Calcium deficiency or magnesium deficiency?

[Slade92]

Hello!
I don't have idea!
Use same water more 2 plant but they are healthy! Water ph is 6.4 and ad calcium and magnesium!
Thanks for help!

 

[TripsRabbit]

Check the roots/media for pests, could be overwatering. Hard to tell without a whole plant pic.

 

[m8ty]

and too many nutrients