Calcium deficiency or potassium deficiency please help!!

[Centralcoastgrow]

What’s up guys any suggestions on the issue with this I’m 4 weeks into flower running Cali magic at 2.5ml per gallon and using gh flora series drain to waste at 900ppm in pro mix under 1000watt gravitas.

 

[hotrodharley]

What’s up guys any suggestions on the issue with this I’m 4 weeks into flower running Cali magic at 2.5ml per gallon and using gh flora series drain to waste at 900ppm in pro mix under 1000watt gravitas.

Dark green shows nitrogen excess and spotting is likely calcium excess. Why cal mag every time? RO water?