Unsure what's going on

so here are my 2 week old plants. The four largest were transplanted to the wilma system and the fifth left growing in its rock wool cube. Interestingly it is now the largest plant (im guessing because it gets so much light)

Anyway, I've been getting a uniform yellowness / drooping in some of my plants and I'm wandering if this is due to over or under watering?

I don' have an EC meter but its in the post and the nutes are mixed at 1/4 of the that given on the label. Ph is consistently 7-8 from the tap and is reduced to 6.5 every two days or so. The water is about a week old.

If you had them in a humidity dome, the change in humidity/temp would cause that effect. Nitrogen migrates to the rootzone in that situation to keep the plant alive. Imho, you should be running your water at a lower ph 6.5 at the highest.

thanks for a speedy reply mate
ok will drop the Ph and see if that helps - will keep the thread updated as to help anyone else with a similar issue;
if anyone else has any other advice that would be appreciated!
check out my grow journal
thanks again for the help rosecity!
regards frank

They look over watered to me.
Tiny little plants in great big pots with drippers.
Sounds like that'd be the issue even without pictures.

I have an issue with my fan leafs not forming (new growth) all the way.. any ideas w/o pics ?