New growth drying out and going yellow...

Im hoping someone hear can give me some advice...the plants hear are about half way through flowering, and over the past week or so their new growth have started going yellow and crispespecially on the top of the plants, there are 16 all at different stages of whatever is happening to them they were fine last week ever since this heatwave started they have just been loking sicker each day, and advice woud be appreciated...

It's too hot for them they need more water and cooler temps

they take a 14lt bucket a day should i give them more??...and its 2 600w lights they are under..

What are your grow room temps and what are you feeding with?

Temps are very high right now and its swealtering outside to getting another fan in there later tonight took a pic of my thermometer and feeds ill post them to...feeds its getting are canna a and b 40mill of each dutch master max boost a capfull and pk13/14.... 15 mill..... thanks alot for your help gentlemen.. added another 2 pics on top....one of thermometer reading and one of feeds

Damn U cooking them. Heat is ur problem for sure. After about 90 or so degrees the plant stops growing. And anything more than that, and the plant starts to burn. U got to find a way to cool them off.Good Luck and Happy Smoking

Thanks.. thought it might be that.....this damn heatwave........ everything was fine before ..... my babies need it to rain and get cold again...im willing to hate summer for that.. getting more fans in there tonite opened windows somemore to, to try and circulate more cool air.... its hard when the air coming in is so hot....