16 days old plants leaves curling and drying

hello people,
registered only now to ask this question.
please see the picture and let me know what do you think it may be? raising humidity will fix the situation (temp is 28c , humidity around 45%)

I have a lot of other plants that are doing well in the same environment (fast bud,NL5XHaze and chocolope)
only those 3 chocolopes having trouble

thank you in advance,
Vico

Is the chocolope need some special care or treatment?

something is wrong there , ph ?

Watering to often?

Probably both
going to buy ph meter tommorow

thank you guys

can i do something to help it recover?
humidity tent?

What are you using for lighting?....they are still at a "tender" age! Looks like lights may be too close and the heat is wilting the plants- soil looks damp enough.

Looks like heat stress too me, sometimes i see this on indica heavy strains when they get too close (less than 6") to my CMH bulb.