Copper deficiency?

some of the leaves in the flowers are yellow in the middle of their length but green at both ends and the veins appear yellowish as well. i am growing in soil. this is a greenhouse thai girl. i have 2 going but this one is showing this anomaly but the other is not. i use gobox nutes and have been using beastie bloomz and a touch of snow storm ultra as well. my water was getting a little bit acidic but i have rectified that in the last week. i am going to be giving them a good flush wednesday so i can start cha ching on friday. the plants are almost 5 weeks into 12/12 lighting though only 4 weeks of showing flowers.

Are they getting any nitrogen or are you giving them just bloom nutes?

How do the lower leaves look? Are they yellowing?

the bloom nutes have a small percentage of nitrogen. not all the flowers have this going on either. the lower leaves are nice and green. it is just the(i hesitate to call them sugar leaves at this point) bud leaves on several branches that exhibit the odd yellowing. i may be over nuting them but the leaf tips don't indicate that i am. cpapp - as a matter of fact, i gave the plants a small dose of the veg nutes yesterday. these are going to flower for 15, 16 or maybe more weeks. the last plant i had of this strain i chopped at 13 weeks and i took it too early. so since they will be flowering so long, i am planning on giving them some nitrogen every so often in addition to the bloom potasium and phosphorus heavy nutes.

The leaves are yellowing from the base outwards it looks like. So dont think it is lack of N. Are there any brown spots showing up? Can you put a picture up of the whole plant?

I'd try to find a fertilizer that contains all the micro's and give it a little bit of that.