Help with problem I.D

[Growingitalone]

Hi all, I have two plants one mother in law from a breeder on my gram and one wedding cake auto from real gorilla seeds with what I'm thinking is a deficiency. They are in canna terra pro soil. They are being fed canna terra Flores. They're under a gavita 600w advanced hps bulb.They're 6 weeks into flower and had zero problems so far this has happened over the space of a week. We've had high temps in the UK at the minute so may be related to that. I have a biscotti which is doing amazing not one problem so far. I'm now unsure as to what to do so any input appreciated thanks. GIA

 

[VaSmile]

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dutch-passion.com

Looks like one of the trace nutes at first glance not cal. Maybe bump up your micro

 

[thumper60]

Looks like heat an light stress to me.

 

[Minbebistillmax]

Have you tested your run off? Looks like you have feed them to much (the dark green color of the leafs.
Mabye a burn of nutrients? Is the PH right?

 

[Growingitalone]

Looks like heat an light stress to me.

That's what I thought to but wanted others opinions I had the same problem last run but wasn't as bad thanks for your input