My plants are about two weeks old. they are under a 1000 watt metal halide bulb the bulb is about 5 ft above them(there are 13) i have a fan on the temp is about 90 when light is on and 80 when its off. is that too hot? the humidity is always about 45. a few of them are turning bright yellow on the top leaves and slowing turning yellow on the lower leaves. what should i do help please!

That temp sounds way to high, you want it around 79 i think?

__________________
This is our way of life, A life that was born free.
To follow orders how to live
Was never meant to be.

90 is hot but not so much that the plant will suffer. Certainly yellow growth won't be caused by that temp. Tell us lots more about your grow. Plant age, size of planter, feeding schedule, ph, etc....

the plants are about two and a half weeks i feed them whenever they are dry. every other feeding i mix in super thrive and fish fertalizer 4-1-1 mixture. the pots are 14" wide and 10" deep. miracle grow potting soil which feeds plants for three months. they range in size from six inches to a foot. i need to get a ph reader but havent had the time to look in to getting one. any recommendations. there are six different strains growing cheese, purple extreme, purple bubba, blackberry bubba kush, og kush, og and sour diseal mix, and banana kush.