Help with problem I.D

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

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

Looks like heat an light stress to me.

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?

thumper60 said:

Looks like heat an light stress to me.

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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