Rocklock Growth at Standstill...

Ok, I have three Rocklocks and one Strawberry Blue female plants under a 250W HPS.
The SB is looking amazing, white with trichomes, hairs turning red, smells great, I mean amazing....
The Rocklock on the other hand has been having problems since day one. There is one mother and two clones, the mother and one clone have yellow leaves with slight brown tips, and arent lookin good in my opinion.
This is my third grow, first one eaten by a dog, and second turnin out ok from a hydro clone.
I really want this to turn out great, can anyone tell me whats up with the Rocklock? I think it may be nute/ph burn...and I have been flushin for a week and it looks a little better but still the sameish...

PS The pics are jumbled...There may be a SB in there somewhere...

Here's a pic of the Strawberry Blue for comparison...They are in the same cabinet, so it's not fungal or disease...
This shit BTW...I recommend to anyone, it grows easy, quick, and like a beast!
Also smells amazing!


Some of these may be in the other post...

Looks like heat damage and a potassium deficiency. Could be from too much Calcium, or a build up of sodium from your fertilizers.

More potassium on the Rocklock and lower temperatures should make an improvement, might not fix everything, but that is probably the direction to head in.