Overwatering or temperatures too high?

Hi All ,

a friend of mine is having some trouble with his clones.
I believe temps in the day in there are up to 28/29 degrees Celsius. And I know for a fact he was watering too much for the first week and a half.

What does this look like ?

any help is much appreciated.
Blessings

Looks like the light is too close

Looks like heat stress, do you have any airflow?

Tacoing leaves like that is usually heat, if they are under HID those temps are way too hot, if LEDs then only a little too hot.

Are you spraying them with anything? Sometimes spraying with lights on can cause an issue or possibly too much airflow, judging by it only being the upper leaves it probably is too much light/heat on them. The plant will taco in to avoid being overlit but with artificial overhead lighting there is no escaping it and you'll have this result of crispy taco shell looking leaves.

humidity and temp is all wrong ,I’d say .