Flowering Problem - Please Help

I am on my 6th week of flowering. I used fox farms organic soil and have been using the fox farms organic nutrient trio.

The leaves up top are starting to yellow and dry and I'm not sure why. I know at this point they are supposed to do this but it seems like it is happening really high up.

Any feedback would help a lot....thanks in advance

I have two plants in 3 gallon smart pots. Each plant has a sugar leaf that has a yellow tip on the top most bud (this is what concerns me).

jdankman said:

I have two plants in 3 gallon smart pots. Each plant has a sugar leaf that has a yellow tip on the top most bud (this is what concerns me).

Click to expand...

What temps and how close is the light from canopy top??...the top pic looks like some heat stress... Also get pics with light off....thx

Yeah my thermostat broke and just realized the temp was around 88-90. They are around a foot away from the light.

FFOF is organic soil and the trio open sesame, chaching and beastie blooms are not organic. If that's what you're using you might have a salt build up causing lockout. Temps are excessive, depending on the size of the light you might be too close. Three questions: is that the trio your talking about? what size light? can you get the temps lower?

No I am using the big bloom, grow big and tiger bloom (and using them by the chart given with them). Light is 400w HPS, Tent 3x3x6 and I WAS using just a hood with no ventilation or fan. I just bought a little inline duct fan, some duct and a 6 inch usb fan

jdankman said:

No I am using the big bloom, grow big and tiger bloom (and using them by the chart given with them). Light is 400w HPS, Tent 3x3x6 and I WAS using just a hood with no ventilation or fan. I just bought a little inline duct fan, some duct and a 6 inch usb fan

Click to expand...

Have you been adjusting the ph of your nutrient solution?

I have not, is that necessary and do you think that is the reason the plant looks that way over the fact that I had no ventilation and the temps were too high?

Too much heat and air issues - have you figure the "cfm's" for your grow space Lighting ? Distance from plants ? When leaves "turn-up" meaning too hot