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looks to me the curling is quite possibly from heat stress, and yellowing is natural during flowering as the nitrogen dissipates from the leaves the stop from growing and just produce its flowers

should more botanicare Cal-Mag be added to it then?

kinda looks like the problem im having at https://www.rollitup.org/marijuana-plant-problems/383956-nutrient-problem-test-guess-whats.html except mine isn't flowering. are there any curling in the leaves at all?

general hydroponics PH control kit is whats being used (bottle of ph up, down, test vial, testing solution) nutrients and water is always tested at 6.0 before added to growing medium.

Anyone have an idea what is going on here? whole plant looks good except the terminal tops. new growth is yellow and becoming more and more deformed. this plant motherplant was flushed with clearex over a week ago because of this problem and a diluted nutrient (botanicare line) was added to it...