Nutrient deficiency week 6 of flower.

I’m growing 2 white widows and 2 girl guide platinum in pre buffered coco/perlite and I have an ongoing deficiency that I can’t figure out. I’m in week 6 of flower and I’m worried it’s going to catch up to my flowers. I’m running gh flora series at about 60% with 75% Cali magic and 50% koolbloom ph’d to 6.0 and ec 1.2 (0.2 without nutes) under a 600 watt hps in a 4x4. Any help would be greatly appreciated.

 

No there’s no filter just the yellow from the light. Maybe this picture is a bit better

 

I didn’t flush when I flipped over to flower, it seems like opinions were split on that.

I feed at lights on and again halfway through, I always feed to run off and I always feed with nutrients. And thanks! Happy to be here and thankful for the help

 

Thanks for the reply headhunter. I went back in my journal and I forgot I did a flush with Florakleen in early flower because my output ec was really high. I only flushed for 1 day then the next few days I dropped my nutrients to 25% before slowly working my way back up. There’s no white looking stuff on the medium that I can see.