Heat Issue? Need advice

I have a single plant that has been budding for about 3 weeks and I moved it into a new bigger grow box and now I am having this issue.

This is only my second grow and the first time with a 400w cool tube.

This is an indoor grow. I am watering about once a week and feeding foxfarm trio every other watering per their schedule. As I said I have a 400w HPS bulb in cool tube dimmed to 75%. There is ac AC vent piped into the box.

I just raised the light to it's max height and moved the point where the AC enters the box to be right under the light. Before it was above the lights.

Any help would be greatly appreciated. Thanks in advance!

Rock Lobster

That looks more like nute burn rather than heat stress. What FF products do you consider the Trio?

Big Bloom, Grow Big and Tiger Bloom. But I have not feed them in almost 2 weeks

High heat won't help a nute burn at all. I'd take some ppm measurements on your run off because those products build up your salt levels pretty good.

Canopy temp?

I can hold my had above the plants without feeling any real hot temps. What should I be looking for in ppm for the run-off?

rocklobster4040 said:

I can hold my had above the plants without feeling any real hot temps. What should I be looking for in ppm for the run-off?

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If your run-off ppm is significantly higher than your nute ppm, you can be sure they are overfed and possibly developing or have a toxic salt buildup.

I check the run-off and it was about 2100ppm, so I flushed it down to about 500ppm so I will see if this helps. Thanks for the help

I have the same problem with 4 plants, but only at 800ppm flushed it and tested a week later, at 120ppm. Plants dont look better but mine are budding so i guess its cross my fingers

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