Newbie, yellow brown spots with aroma.

[Charlieghoul]

Hey all, would like to start off by saying thankyou to all the rad people in this place for the abundance of information. Unfortunately even with all that info out there i still need a little advice lol.

This is my first grow. My plants are about 3 weeks old from germination. On a 24 hour on light schedule about a foot away. They are all sitting in a bubble bucket with 3 airstones running 24. Introduced feeding a week ago at very low levels, using gh grow and micro. Only fed about about 90ppm...i think. Checked today was at 87.
So this morning all plants were fine, i checked 11 hrs later when i got home and one has yellow brown spot on bottom leaves towards center. The leaves have a shine to it in the area, and also have an aroma like a bud plant in the spot? So strange.
Any help would be much appreciated
Also i know showing sign of heat stess, just moved lights up aswell.

 

[polishpollack]

That ppm seems very low. Lights on 24 probably isn't necessary. 18/6 or a little less should be fine. what fert are you using? this is DWC right?

 

[Charlieghoul]

That ppm seems very low. Lights on 24 probably isn't necessary. 18/6 or a little less should be fine. what fert are you using? this is DWC right?

Yes super low, i thought so too. But this was the recommended measurements from general hydroponics for seedling. 1ml per gallon of both gro and micro. I am using distilled water. Yes this is dwc, and they will be moved to there own buckets when large enough.
Ok cool, will keep that in mind for lights.

 

[Charlieghoul]

Ohh and am also using a rapidstart root enhancer from general hydroponics at 1ml per 2gallons.

 

[polishpollack]

Don't keep in mind for lights. Make the change. Plants don't need light 24/7. Probably not good for them anyway. The thing to do is decide what ppm you need now. How about the hydro forum?

 

[Charlieghoul]

Don't keep in mind for lights. Make the change. Plants don't need light 24/7. Probably not good for them anyway. The thing to do is decide what ppm you need now. How about the hydro forum?

Will do just gotta grab a timer when i get the chance.
Ok definitely, will look more into that foram aswell. Do you think this is most likely nutrient related?
The others seem happy.
At first glance i thought it was something that had grown on the leave itself like a mold. But i am at low humidity aswell, 30rh.

 

[Charlieghoul]

Ok so after further reading im thinking i need to add some calmag aswell. So ill be doing that and upping the nutes. Hopefully this does the trick.
Im astonished as to how fast these plants show changes. This little lady i though was doing especially well since she has massive roots compared to others. But ‍... live and learn.

 

[polishpollack]

I forgot to ask if you have roots into the water. It might be a good idea to dip a cup into the water mix, then replace the top and pour the mix over the clay pebbles. If you can do that several times a day, that's good, until the roots are well-established.

 

[Charlieghoul]

I forgot to ask if you have roots into the water. It might be a good idea to dip a cup into the water mix, then replace the top and pour the mix over the clay pebbles. If you can do that several times a day, that's good, until the roots are well-established.

The water is sitting about an 1-2 inches below cup level. But all my roots are growing strong. Every one of them has already got a good amount of roots in water.

 

[Charlieghoul]

I forgot to ask if you have roots into the water. It might be a good idea to dip a cup into the water mix, then replace the top and pour the mix over the clay pebbles. If you can do that several times a day, that's good, until the roots are well-established.

Ohh i have a pic of roots. This is the plant that is affected.
Checked this morning as seems to be spreading very slowly. I upped nutes and added calmag last night. But didnt expect to see result right away.

 

[polishpollack]

Do you plan on leaving them in that container, or switch to individual buckets? If switching, you should do so soon as the roots might tangle later. I think you can plan on around 500 ppm soon. Then maybe 750 or so. I've heard of as much as 1100 being successful but I never tried it. You might ask in the hydro forum for suggestions for your particular fert.

 

[Charlieghoul]

Do you plan on leaving them in that container, or switch to individual buckets? If switching, you should do so soon as the roots might tangle later. I think you can plan on around 500 ppm soon. Then maybe 750 or so. I've heard of as much as 1100 being successful but I never tried it. You might ask in the hydro forum for suggestions for your particular fert.

Yes they are going to be moved this week.

 

[Charlieghoul]

So update. I upped the nutrients to about 400ppm the water is sitting steady at 5.8ph. Change was made sunday
The leaves that were affected have continued to be taken over and are dying, which from what i was reading was to be expected. But a couple tiny specs have stared to form on newer leaves and another one of my plants is showing signs on onlder leaves.
This is all starting on lower leaves first. Ive also noticed that the plants were showing signs of what i though was heat stress on the leaves effected before showing brown spots. (Curling up-shown in first image)

Still not sure what this is exactly, was hoping if it was the nutrients, upping the ppm would atleast stop any new spots from forming.
Anyone have ideas?
Ohh! My leaves also feel very dry. Not sure if related. Any help is appreciated!

 

[polishpollack]

Your new growth looks too pale green. I'd make sure the roots are well into the water and raise the ppm to 600 unless you see darker green at this point. What fert are you using? About the browning, I don't know what that is but if the area is too warm, could be heat related but that is the obvious part. It might be a mix of nutrient problem and heat. Hard to say. what are the room temps like, high and low? You should have a small fan moving air too. Is that 33% or 93% humidity?

 

[Charlieghoul]

Your new growth looks too pale green. I'd make sure the roots are well into the water and raise the ppm to 600 unless you see darker green at this point. What fert are you using? About the browning, I don't know what that is but if the area is too warm, could be heat related but that is the obvious part. It might be a mix of nutrient problem and heat. Hard to say. what are the room temps like, high and low? You should have a small fan moving air too. Is that 33% or 93% humidity?

Yeah was thinking the same thing, i upped the dose of calmag i gave them last night. Brought the ppms to 500. I woke up to them with a bit more green. is this still too pale? I am using general hydroponics nutrients.
I was thinking heat. But i very much dont belive that is what is happening now. My temps at 70 low, 79 high and there is a fan constantly moving air over the plants. Also 33 rh. None of the growth nearest to light shows problem, only older leaves. Which makes me believe its nutes forsure.
Ill just keep upping them slowly till i see it either go away or see signs of burn.

Theyre being moved in a day or two to seperate buckets. The roots are getting too big for one spot.

 

[polishpollack]

If you're using all three GH bottles, isn't calmag in the mix? I'd be careful how much calmag you give. I suspect people are overdoing it. That recent pic looks pretty good. I'd go to 600 ppm if I were you, if not a little higher, especially after you transplant. In 2-3 days I would consider going to 750 and see what happens. I still don't have a guess on the leaf tissue death, but it may have been a nutrient problem. 79F is a little warm for an indoor grow but not terrible. However your plants were still real small and perhaps vulnerable to high temp. Hard to say right now. If you could keep temp no more than 76F and raise that ppm some after transplant and all else goes well, you'll see remarkable growth because DWC is the shit way to go. You just have to keep an eye on it to ensure you pH and ppm doesn't get out of whack too much, and make sure your buckets don't allow any light to the water or algae will grow and choke off your roots. If that happens you might as well throw it all away and build a more light-tight set up because once you have algae they always come back. You can add some Hydroguard to reduce them. People try peroxide but I'm not sure that's a good idea. Lifting the lid for a short time shouldn't be a problem, however.

 

[Charlieghoul]

If you're using all three GH bottles, isn't calmag in the mix? I'd be careful how much calmag you give. I suspect people are overdoing it. That recent pic looks pretty good. I'd go to 600 ppm if I were you, if not a little higher, especially after you transplant. In 2-3 days I would consider going to 750 and see what happens. I still don't have a guess on the leaf tissue death, but it may have been a nutrient problem. 79F is a little warm for an indoor grow but not terrible. However your plants were still real small and perhaps vulnerable to high temp. Hard to say right now. If you could keep temp no more than 76F and raise that ppm some after transplant and all else goes well, you'll see remarkable growth because DWC is the shit way to go. You just have to keep an eye on it to ensure you pH and ppm doesn't get out of whack too much, and make sure your buckets don't allow any light to the water or algae will grow and choke off your roots. If that happens you might as well throw it all away and build a more light-tight set up because once you have algae they always come back. You can add some Hydroguard to reduce them. People try peroxide but I'm not sure that's a good idea. Lifting the lid for a short time shouldn't be a problem, however.

No not all three just grow and micro initially. And i am still only at half strength of calmag recommended dose. But i am considering trying the lucas formula where you only use mirco and bloom, i am reading this formula doesnt need calmag addedand is super simple too.
I will def try to keep temp down. But my seedlings didnt show sign of heat stress in the first two weeks didnt start till the third.

Im already surprised how quickly they grow, so cool to watch.
I appreciate all the help pollishpollack. Ill be following your words and see how it works out. Hopefully the next update is a good one. Considering doing a grow log aswell.

 

[polishpollack]

I've never used the GH trio, but I suspect the company intends all 3 to be used as I know there is something in the Grow that isn't in the other two. I would try using all three unless you don't have the green one and really don't want to buy it. The problem with Lucas is that it might really be intended for the flower cycle and you're far from that now. You might do the best research you can and contact the company directly and see if they can enlighten you on how to use them in the veg and bloom cycles. Specifically ask about Lucas and see what they say. They will probably tell you to use all three for the duration, just change the amounts of each per gallon of water, like cut back on on the Grow in bloom, but that's just a guess. There are charts on the web you can find and follow, but I don't know how successful that will be.

 

[Charlieghoul]

I've never used the GH trio, but I suspect the company intends all 3 to be used as I know there is something in the Grow that isn't in the other two. I would try using all three unless you don't have the green one and really don't want to buy it. The problem with Lucas is that it might really be intended for the flower cycle and you're far from that now. You might do the best research you can and contact the company directly and see if they can enlighten you on how to use them in the veg and bloom cycles. Specifically ask about Lucas and see what they say. They will probably tell you to use all three for the duration, just change the amounts of each per gallon of water, like cut back on on the Grow in bloom, but that's just a guess. There are charts on the web you can find and follow, but I don't know how successful that will be.

Damn, yeah i didnt think of that. First thought was that bloom wouldve bin when they were in flower.
I did more research and ended up going with lucas, from what i could gather it is perfectly fine to use throughout the veg aswell as flower cycle.

 

[Charlieghoul]

Heres a photo of how they look now. The problem did continue for a bit but seems to have settled now.

I am almost positive that the issue was a calcium/mag deficiency. For anyone that may stumble across this with like symptoms.