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[Slyvie]

Help! I am a fairly new grower who has no found the right rhythm yet. I first tried hydro which I had better success with, but I did not like how much water I ended up going through a few power outages that didn't prove well for the bubble buckets.

I am currently using a coco/ perlite mix and the older leaves of my seedling are turning light on the edges. I thought I over watered it so I've cut back on the amount I water and there are two baby leaves growing. So that is exciting, but I'm still concerned about those leaves that are turning light on the edges.

Maybe I transplanted it too early and then over watered? she is in a 3 gallon fabric pot. Temp is pretty steady about 76 most of the time and RH around 55 to 65. I am using the flora trio and calmag for nutes, following the coco nute schedule provided on this site. I need to water today after the lights come back on (they will turn off here soon).

This plant is way behind schedule. I am using a 100 W LED vivosun light.

I've started two more seeds because im not sure about this ones health, but I dont want to make the same mistakes again.. any advice?

[Gaz21]

Oh had a peak of the roots. They look just fine. I'm thinking just A+B+CALMAG and CX Regena root but NO P/K but that will probably be a mistake. I reckon I can just ride it out as it is. But I'd love to get it right and know whats wrong. I also have a water pump in the rez just for circulation. I'm wondering if it's too powerful and causing the sludge? But if that's the cause of the sludge,would that cause problems in the plants?

[Gaz21]

I'm actually emptying the rez right now and giving everything a good clean. It's a 50 litre rez. And they've used half of it. There was some sludge. I'm just letting the fresh water settle a little more I did get the fresh water prepared yesterday . But sat here scratching my head thinking what to put in it.

[Gaz21]

No I don't have a mulders chart and wouldn't know what to do with it if I did. But I will do some reading up. Yes I keep getting sludge in the rez. I'm guessing sterile. I'm in coco/perlite and using a range called CX horticulture. I'm running them as directed.

[Rootsruler]

As you're in hydro, if the issue is progressing from top to bottom I'm guessing it's something in your res makeup. Do you have a Mulders Chart? Any gunk or sludge forming? Do you run sterile or live? Might be root related. How is your root health? Pic looks clean but I don't know if that's all the roots.

[Gaz21]

Potassium toxicity,throwing all the other nutes out of whack?? Thats what I'm thinking now. But I'm hoping for your thoughts before emptying the rez and remix with less potassium

[Gaz21]

So the first one is from one of the healthy plants. The other pics are from the sick plant. Which are in the order I took them off. Bottom to top of the plant. It seems it kind of started at the top of the plant. Which is another reason that I thought it was initially light stress. The leaves went a lighter shade of green initially. That was the first sign that I had an issue. Then the other symptoms came afterwards. It looks like one of the other plants is becoming lighter in colour now. But no other symptoms on that one yet. If you look at the first image. All the leaves was that darker green all through veg and 4 weeks of flowering until now end of week 5. (The last image is from the very top of the plant)

[Rootsruler]

Can you pluck one of the leaves from the plant and take a picture of it under natural light? That will help us in determining what is happening with your plant.

[Gaz21]

Thank you very much. ✌️🫡

[Bluey]

I'm not sure. You appear to have an N deficiency but hard to tell as the colour was all washed out in your pic.

An N deficiency can result from moving from veg to bloom nutes too soon after flipping. I wait for first preflower and then transition them over a couple of weeks.

You could be Potassium deficient also which is easy to mistake for nute burn so I'd take an approach for one thing at a time..lights raised done, now fix one or two of your nutes then suppliment if necessary.

[Gaz21]

1 week after flip. So is it calmag deficiency?? IYO

[Bluey]

Yes they can act differently.

Give your plants an additional cal/mag suppliment like calimagic.

When did you stop veg nutes and start flower nutes relative to the flip?

[Gaz21]

Thankyou for your replies. I'm sorry about the pictures. The problem seems to be getting worse now. It's like there is lots going on. In my limited knowledge. It's only one plant though. Can one plant out of 4 clones from the same mother react differently,in the exact same environment? Sorry for the extra question

[Rootsruler]

Agreed! You say you backed off the light to 850 umol but 850 umol is pretty high so if you backed it off from there my guess is they got light stress.

[Bluey]

It's really hard to tell from those pics.
Nute burn is a browning of the leaf tips, they often curl up and the brown spreads a little down the margins of the leaf.
Nute deficiency is a yellowing or lightening of the tips, which can also indicate light burn and is often combined with heat stress.
I think you may have had some light stress.
Those dark lines down the middle of the leaf, is that normal for those plants, if not, it could be copper or calcium deficiency BUT I can't see any other symptoms so I doubt it.
We need much better pics.