You will need to provided appropriate information regarding your grow for any of us to help you. looks like it could be a few things. Root zone ringing a bell...
Tent size is 2.5 ft x 2.5ft x 5ft I’m growing in foxfarm happy frog. Using half the recommended dose of elite nutrients and bud candy Temps between 74 and 78 Humidity between 50% and 53% I flushed with 6.5 ph’d tap water and the run off came out at ph 6.5 I try to water when the top few inches of the soil is dry and I pick the plant up to see how heavy it is Lights on 24/0 using 2 600 watt led I have 2 monkey fans and 4 inch 188cfw exhaust fan
After I flushed I didn’t add anything should I add some cal mag? Or just let it dry out and add it the next time I water?
Leaves curling inward, yellowing from center out. Yellowing throughout plant. Magnesium deficiency. Give it some cal-mag next time you water.