Mg issue?

I have searched some, I just don't feel confident yet in diagnosing a plant when every plant reacts a little differently.

-Nirvana White widow
-Grown in CFL Cabinet
-Day 16 of flowering
-Watered every 3-5 days with BioThrive Bloom 3 TBS/gallon

Ive been told not to pH my water with the Biothrive line, and its been going just fine for about a month. I woke up this morning (lights came on at 1 am) and my cabinet was in the high 80's. I usually keep it in the low 80's. Not sure why its getting so much harder to keep the temps down. I initially thought this was heat stress as it isn't far off a light, but I am seeing less obvious cases on other fan leaves. It doesn't appear everywhere though. Am I right in treating this as a mg deficiency and adding some epsom salts? I also have some curl/twisting in a few lower fan leaves.

Not sure how fast this happens, but I didn't see it at 1 am, and did see it at 10am.

Who told you not to pH?

The second picture with the curl/twisting fan leaf looks like it could be a heat issue or watering issue. I think your spot on with the MG deficiency on the other pic.

MoJobud said:

Who told you not to pH?

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Search pH and biothrive. Most results say not to. GH even says it buffers itself. I think with organic products you just want it to do its own thing.

Sticky2ice said:

The second picture with the curl/twisting fan leaf looks like it could be a heat issue or watering issue. I think your spot on with the MG deficiency on the other pic.

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I've let my pot dry out between waterings, and I just watered 2 days ago. Probably heat, although it's only leaves under the canopy. I probably won't worry about it unless it spreads to newer, higher leaves.

Good to know I can spot these things better now. Hopefully the epsom salts knock it out.