Is this Mag & Cal or ? deficiency?

[bigbud hoop]

Hello... We're growing indoors in soil. Take a look at these photos. Does it look like a magnesium &/or calcium deficiency? The plants just started their 6th week in flower. We fertilize every other watering & pH is always around the mid 6's. PPM in our water is around 60. Day temp in the room is around 75. Thanks for your help.

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This is definitely a huge deficiency probably cal mag...you also state your ppm is 60 what's the ppm after you add your nutes? It should be 860 ... and I have gone as high as 1000 total ppm for the nutes you added and 60 that was in your water when you started...I personal fert every watering in bloom...until 2 weeks prior to harvest then nothing but a flush w/water