Lower leaf death and Clawing in Week 4 12/12 , no Nitrogen in weeks, temps 65-81F

In week 4 of 12/12, 15 plants, 50-55%RH, on a flood table, some affected some not. Temps never above 81 or below 65. Res temp at 65 with a chiller. GH 3 part, tap water, pH, DM Zone, 1.5ml/35gal Physan20, monster bloom 1/2 strength. I have not run over 1000ppm yet as I was battling brown slime last grow. No sign of it this grow and the roots look nice and white.

I am thinking magnesium and calcium deficiency (but I'm on 200ppm tap water) because of the chlorotic spots, yellowing of older leaves, but just in the last few days I have noticed major clawing and some lower leaf die off.

Im at 820ppm right now, 5.7ph, added some MagiCal and Pro Tekt Potassium silicate at 1/2 strength then adjusted just before this post.

Any ideas? I haven't fed GH Gro since the switch to flower.

If ur using tap water then it is more likely to be Mg def. I use RO and have to add both. Last pic looks like Mg.

Yup mg def just wait awhile for your call-mag to kicj in

Thanks for the reassurance dudes. I'll report back thru the grow and see if how/If it improves.

Is that what causes that clawing of the leaves is cal/mag def? Cause I had mixed some lime into my soil before I started growing and I use a fert that has both calcium and Mg in it the ff grow big.

If CalMag is locked or deficient then it may affect other elements, but I was under the impression that eagles claw was from Nitrogen overdose...even tho that is impossible in my case.