7 week flowering a lot of leaves drying up

Hello Everyone,

This is my second grow ever and only my first one I am doing right. I have a 3x2x5.5' tent with a 400W HPS light and a passive intake and inline fan and carbon filter for exhaust. I also have two fans for circulation. My temps stay around 90 F which I know is high. I am growing three different strains AK47xNorthern Lights, Pineapple Express, and G13 Haze. The Pineapple Express is in the middle it is about a week older then the other two but all went into flowering at the same time. Up until now the plants have been great. Over the last week a lot of the sugar leave have been turning brown and getting crispy. I have a 40x magnifier and have been checking the trichomes and none of them seem to be amber yet. I guess they look kind of cloudy.

i just need to know when they are going to be ready and if I need to do anything to correct any problems that may be occurring. Any and all help is appreciated. Thank you!

Please let me know what other information you need to help me out.

It's cool man. There Annuals there only supposed to live for one growing season.
7 weeks in your almost done. 1-2 more weeks to go?
It's hard to say, but you might have a Mag def. Leaves curling up. I wouldn't worry about to much. you could get some cal/mag.
Use the Cal/Mag as a preventative every month on your next grow.

These are the three I have going now.

This is the Pineapple Express that I think will be done soon let me know what you think.

More pineapple express 7 weeks into flowering

G13 Haze what's going on with the leaves?

This is the AK47 x NL. What Cha think?

I added some calcium via a spray mixed with water. Lets see how this works.