Need help clarifying my leaf problem...

Hey guys! Just wanted to clarify the problem I'm experiencing ... not so sure if this is led burn, nutrient burn or a ph problem... just recently found out that my probe was not calibrated and it was swinging below ph 4.

I'm currently running two RDWC setups with 8x 5 gallon buckets and 450w (from wall) led, 15 inches above canopy; one being the vegetation area and another being the flowering. I would feed my ladies around 500-800 ppm. Each are showing similar but somewhat different signs of led burn, nutrient burn or a ph problem ... I am confused.

Hope you guys can help! Photos seen below.

Vegetating Plant 1:


Flowering Plant 2:

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Click the chart to enlarge. Looks like some nutrient burn and perhaps a mag def,.

Also looks like you went heavy on the Nitrogen. Dark green glossy leaves. Tips curling down on you.

The thing is with ph problems is that it can resemble many other deficiencies. By looking at your leaf discoloration ph would be the most likely culprit. Get your ph in check

CannabisErecticus said:

The thing is with ph problems is that it can resemble many other deficiencies. By looking at your leaf discoloration ph would be the most likely culprit. Get your ph in check

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Thanks for this! Replaced my water weekly and it seemed to have solved the fluctuations!

Hey guys, is this led burn? It’s placed 24 inches away from the canopy from a 450 watt wall draw LED fixture.

Also getting these weird gray spots on my ladies ... what could this be?

Hobbes said:

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Click the chart to enlarge. Looks like some nutrient burn and perhaps a mag def,.

View attachment 4736419

View attachment 4736420

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Thanks for the share! Definitely keeping these in my notes

captainforest said:

Also getting these weird gray spots on my ladies ... what could this be?

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New spots came in and they’re really white lol

are these molds??? But they don’t look powdery at all ... more like the pigment disappeared

This lady also has had this color shade and pattern her whole life ... is this normal?

This is my system btw! Newbie here hope to get some advice! Thanks!

Recirculating waterfall dwc
2 sets of:

4 by 8 grow tent
1/4 hp chiller; water temp 21c
65 gallon water volume
Two Sf4000 spider farmer (450w draw)
12w uv sterilized
500 ppm
5.8 ph swings up to 6.5

Other led now is a bestva. About to get the other spiderfarmer

Its really messy cause the other rooms were under construction which just finished... the dust and heat affected these ladies for the first few months

Aand these are my roots currently chilled at 21c! These are 30 gallon totes

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How's the leaf problem? Has it stopped spreading?

Nice grow!

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captainforest said:

Also getting these weird gray spots on my ladies ... what could this be?

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Doesn't look like powdery mildew.

Hobbes said:

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How's the leaf problem? Has it stopped spreading?

Nice grow!

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Thanks but i think ive made so many mistakes yield gonna be crap for sure ! Yes it stopped spreading but it’s still there. Not sure what to do about it but it seems to still be growing anyways.

Not sure but I think a big part of this problem was caused by the stress these ladies had during their seedling stages.. (heat/dryness/low ph)

Hobbes said:

Doesn't look like powdery mildew.

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Yea.. does it have anything to do with the led burning it?

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No, there would be more canoeing in the upper leaves from heat stress.

captainforest said:

Yes it stopped spreading but it’s still there. Not sure what to do about it but it seems to still be growing anyways.

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The affected leaves will never recover, so long as it's stopped spreading you'll be fine.

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Hobbes said:

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No, there would be more canoeing in the upper leaves from heat stress.



The affected leaves will never recover, so long as it's stopped spreading you'll be fine.

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Awesome! It did stop spreading. The other plant though has this weird color pattern on her all over ... very light green but its growing well haha

So i just flipped into flowering. Do you guys think i should defoliate?