Discolored leaves

750w approx 18 in from light

Temp has got as high as 84 degrees, but has been corrected.

Humidity fluctuates frequently between 29 and 42%

Inside of a grow tent, other plants look good.

Using Botanicare Pro Blend nute system.

Thee are young plants @Sp22 ? I'd guess this one was getting too much light. Welcome to Roll It Up and good luck!

Yes, young plants a little more than a month old from seed. I did allow the coco to get pretty dry in between last watering. Could that have an effect?

Sp22 said:

Yes, young plants a little more than a month old from seed. I did allow the coco to get pretty dry in between last watering. Could that have an effect?

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Yes, for a few reasons maybe. When the moisture level drops around the roots it is possible fertilizers are drawn from the plant instead of in. Or the root tips dry completely and die. Sorry, being melodramatic. Your girls look fine and I'd be careful about overreacting. The other hassle when growing in coco and the coco drying out is a buildup of these fertilizers or salts.

I grow in coco and water with a run-off to prevent a buildup. If you make more than one change at a time it is hard to know what's causing what. If I were going to do one thing I might increase the amount of water I gave at each feeding, so I got more runoff. After a few larger feedings the buildup is likely reduced and all is fine.

I'd also be careful about how much light young plants get and how close the light is to the leaves. A true 700watts at 18-inches too early or mabye intorduced too quckly (start higher as an introduction) before they are mature enough could easily stress a plant.

Your little one is lacking magnesium too

You look short on Mg...a peril of using coco. From Botanicare's website in reference to your nutrient (Pure Blend Pro) " If using reverse osmosis water and or in coco coir, it’s recommended to add 5 ml of Cal-Mag Plus per gallon of water. Use with every watering." Good luck friend.