Is this light burn?

I'm not a coco fan but everything I've read about coco is it should be in the same pH range as hydro so around 5.5 to 5.8. That's what I aim for using Promix HP with hydro nutes. I never worry about pH using AN 3-part pH Perfect nutes.

DWC or soilless I never bother to check pH when feeding/watering. I only use good RO water for my plants too.

OldMedUser said:

I'm not a coco fan but everything I've read about coco is it should be in the same pH range as hydro so around 5.5 to 5.8. That's what I aim for using Promix HP with hydro nutes. I never worry about pH using AN 3-part pH Perfect nutes.

DWC or soilless I never bother to check pH when feeding/watering. I only use good RO water for my plants too.

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Sounds good!
I'm just thinking the OP likely has a low PH and raising it might help.
I wonder how many plant problems are simply the op having a bad or un calibrated pen.

Would you rule out root rot?

The OP hasn't checked in since Friday and the plant looks like it's been struggling for a long time.

Not the same urgency as a newbie who can't wait 2 hours without bumping a thread lol.

Kushash said:

Sounds good!
I'm just thinking the OP likely has a low PH and raising it might help.
I wonder how many plant problems are simply the op having a bad or un calibrated pen.

Would you rule out root rot?

The OP hasn't checked in since Friday and the plant looks like it's been struggling for a long time.

Not the same urgency as a newbie who can't wait 2 hours without bumping a thread lol.

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I'm thinking he might be better off pushing some runoff followed with some nice pH 5.5- 6 half strength nutes as it looks a bit like toxic salts buildup to me and re-establishing a balance won't hurt.

Trying to do a 3x flush is a major PITA but forcing a full pot of water through with the nute mix after ain't so bad. A shop vac is great if you can't take the plant to a sink or bathtub but a small bath towel makes quick work out of removing runoff from the tray like I've done today with my plant after adding more water to force runoff after a full watering yesterday. She's not a happy camper 3 weeks into budding so trying to turn her around.

600W Hortilux SHPS, 7gal pot with Promix HP and various organic feeds added. Mainly Mega Crop nutes with some AN. Runoff pH 6.7 @ 710ppm tonight. CO2 added around 1250ppm with alcohol lamp burning 99.9% methyl hydrate. Was horizontal until a week ago when I flipped her to get more floor space.