Is it heat stress or not??

tyke1973 said:

If you are liveing in the uk put your fan's on a timer at night it is too cold for the fans to be on during the 6 hour lights off.i would higher my lights a tad and take the fans of high if they have a high speed just till leaves stop curling .but this problem is either heat stress or the temp flux during lights off.if your plants look ok don't worry so much just higher your light see if it is heat stress.

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Nah the fans are on low, off during the night, and the temperature is solid around 75-60 F so I know it's not heat stress now. I'm thinking phosphorus deficiency but I can't find anywhere to get commercial phosphate to add to the soil/water.

They are turning purple, w/ what is best described as little shiny dots on them. We are in day 4 or so of flowering. What could be causing it? Low pH? Phosphorus? It's getting to be crunch time on the plants so we need a fast cure plz!! Thx!!

If it is a phosphorus deficiency it should adjust itself when you switch to the low N high P&K flowering nutrients. If you over fed them I've heard of them halting nutrient intake almost all together "nutrient lockout' I think is what they called it. As of what the problem is :/ I have no idea, I just thought I'd throw this out there.