What is happening here , heat , pH , nutes at 50% too low ?

Leaves curling

In order for us to identify what the problem is, you need to state what your current setup is like. Temperature, humidity, lights, how far away the lights are, medium, pH, nutrients in use.

You stated half of those in the thread's title, but how would we know if you didn't follow up with the facts?

Heat currently is 33.8c , bubble pots , 2 600w lights about 2 foot away, pH is 6.1, half nutes , humidity?? Who knows lol it seems to be only the biggest ones that are doing it thanks

34C is too hot. You need to dial that back to 28C at the highest, preferably 25-26C (78F).

Yeah I know I answered my own question there lol it's too hot , pH is wrong and nutes are too weak , struggling to lower the heat as it's really hot outside, luckly lights are 18/6 came on at 6pm (7.20pm now) , outside temps will lower in an hour or so, it was 30c when I first opened the tent so my extraction is working well, I don't have an inlet fan either so that could help