Slow growing seedlings

My above mentioned plants are doing real well now. I was seeing some of the same colors you are. The pale yellow-green foliage and some spots on the lower leaves. The solution to my problem was to actually increase the feeding. Mine are a little smaller than yours and already getting a combined 800+ ppms of Botanicare products.
I am not an expert, but after hesitating in increasing my feed for weeks, i finally did it and things are happy.
It may be that the "light feed" of nutes is not enough. Try increasing it on one and if they are in fact just hungry then you should see it within a day.
I am only sharing my experience, and could be totally wrong...but maybe not:jointsmile:

Ive upped the nutes but problem is continuing. Its moving up into the new growth.

Your runoff is WAY too low. You should be aiming for 6.7 runoff. Also, you shoud be running calmag on 'drinking' or RO water. Get the ppm up to 250 before adding nutes, THEN add nutes, THEN check and adjust the pH. Once the nutes are in solution, the pH is testable and matters.
Thanks for the wishes! I think it went GREAT and I expect and offer!

Hey Stinky. I see you said to aim for 6.7 ph runoff in Coco. I was under the impression that 5.8-6.5 was correct since Coco is closer to hydro than soil. You know lots more bout this than I do but I want to make sure I read this post right before I make any wrong changes. thanks.