Need a little help fellow farmers. I just transplanted my plants last week from veg under t5 to 1k hps. It has been about a week and I am starting to see some yellowing. :(

My specs.

Daytime:

temp: 79-80
rh- 70-73
ppm- 900

night time

temp: 72-75
rh- 75-80 (I am using my dehumidifier for drying right now. could this be a vpd issue?)
ppm: 400 ish

medium

3/5 ocean forest.
2/5 perlite/coco

nutrients:
veg+bloom (dirty), ogbiowar bennies, sea green,

foliar: heavy 12 foliar.

I have been water at an E.C. level around .8 for my smaller plants and 1.4 for the larger.


The yellowing is staring from the top of the plant. It leads me to think that it is a calcium deficiency. I have also noticed that the new grow is very rigid. I spoke to chris from Hydroponic Research( veg +bloom) " He thinks that this is not the case because I am using ocean forest." He is lead to believe that I am over watering. But I can't remember having these results in the past.

Any insight. thanks