Any idea what's up with these seedlings?

[FelipeBlu]

Losing chlorophyll in-between veins on a lower leaf is a classic indication of magnesium deficiency. If it’s old and the damage isn’t increasing or showing up on other leaves, you probably got on top of it. But stay on your toes, because that plant is showing a higher need for Mg and might again show you that you need to give it more.
Also, be sure and carefully inspect the underside of the leaves, with magnification if possible, to eliminate the presence of pests. I saw a possible bug in one photo.

 

[MGD420]

Losing chlorophyll in-between veins on a lower leaf is a classic indication of magnesium deficiency. If it’s old and the damage isn’t increasing or showing up on other leaves, you probably got on top of it. But stay on your toes, because that plant is showing a higher need for Mg and might again show you that you need to give it more.
Also, be sure and carefully inspect the underside of the leaves, with magnification if possible, to eliminate the presence of pests. I saw a possible bug in one photo.

Thanks for the reply FelipeBlu.
There doesn't seem to be any of the same symptoms on the leaves higher up but I will keep an eye on all of them especially the one I took those leaves from.

I don't think it's bug's but then again I wouldn't be asking on here for help if I knew what the issue was. I did have a look under the leaves but only with the naked eye but I will look closer next time with a jewelers loupe if I notice anymore spots or marks showing up on the plants.

Was the pic where you think you might have seen a bug on the last 2 pics near the bottom.left of centre leaf ?

 

[FelipeBlu]

Actually, I changed from my phone to my iPad and zoomed in - now I think it’s lint or something.

 

[MGD420]

Actually, I changed from my phone to my iPad and zoomed in - now I think it’s lint or something.

Looking under the leaves was the first thing I did even before I pruned them off as at first I thought it could have been some sort of bug that caused it to go that way but none of the other plants have the same symptoms and they've been close to each other.
I'll definitely be keeping a close eye on it from now on and will give it a closer look with the jewelers loupe later today though.

I have cal mag there if I need it and also have cannacure, it's for treating the plants with bugs, mould and other nasties.

 

[bluter]

it's always good to have a few pics of the issue with the problem leaves on the plant.
it can be easier to diagnose when in context of the whole plant.

that may be either predatory or nutrient based damage.
at this point i'm leaning to a nutrient or ph issue. i don't think it's mag def unless you've already worked past it. the area between the veins would be much lighter if it was still ongoing.

 

[MGD420]

it's always good to have a few pics of the issue with the problem leaves on the plant.
it can be easier to diagnose when in context of the whole plant.

that may be either predatory or nutrient based damage.
at this point i'm leaning to a nutrient or ph issue. i don't think it's mag def unless you've already worked past it. the area between the veins would be much lighter if it was still ongoing.

I've no recent photos with the leaves on the plant at least not up close of the issue itself. Just photos of all the plant's together but will remember for any future issues to take the pics of the plant before removing anything.

I've still not had the chance to go over the plant's with a jewelers loupe but I really don't think it's bug's either. I'm sure it started around the same time when the leaves curled up and yellowed at the edge's, it was around the same time they were transplanted and weren't getting enough nutrients.

Could well possibly be pH as I'm sure my bluelabs pen is slightly off as I haven't used it in months since my last grow so ordered a calibration care kit for the pen, it was delivered today so can calibrate it for the next time I feed them.

 

[MGD420]

@FelipeBlu @bluter

Top half of the leaves going droopy.

Not all the plant's seem to go the same but I have noticed that during the day they look fine but maybe an hour or two before lights out the top leaves start to droop on 2 or 3 of the girls. Only noticed more recently.
Is this due to the plants knowing its almost lights out and getting ready for resting or something else ?

Taken Sunday 5th 20 - 30 mins before lights out at 1am

Taken Saturday 4th at 16:09pm roughly 9 hours apart.

 

[FelipeBlu]

Hola!

This is normal. Once the plants have received enough light, they go into a different part of the daily cycle. They technically don’t need a dark time in veg - they “go to sleep“ internally.

 

[FelipeBlu]

You could probably cut back an hour or so a day if cost of energy is a concern.

 

[MGD420]

Hola!

This is normal. Once the plants have received enough light, they go into a different part of the daily cycle. They technically don’t need a dark time in veg - they “go to sleep“ internally.

Thanks for confirming what I was thinking.
I just wasn't 100% sure so thought it would be best to ask.
Only noticed it more over the past couple of night's but during the day they always look fine, leaves propped up.

 

[MGD420]

You could probably cut back an hour or so a day if cost of energy is a concern.

I cut back from 18/6 to 16/8 a couple of nights back.

Before any changes were made.
The plants were only occupying half the 8x4 so we're cramped into a 4x4 space under 1 SP3000 led light.

They're now spread over the full 8 ft length but are under 2 SP3000 led lights.


Would I be better dropping from 16/8 or would it be better to drop the light intensity from 75% down to say 50%

 

[MGD420]

This might be a silly question.

I know with them being autos ideally light cycles of 16/8 or more is preferable.
Like with my last grow once they started to grow buds I increased the light cycle from 18/6 to 20/4.

As they're in early stages of bloom how detrimental to yield is it to have the light on less than say 16/8 ? Does it have a huge impact or is it more when they're actually producing bud as apposed to pistils in early stages ?

 

[FelipeBlu]

Since they’re autos (I forgot), I wouldn’t reduce the duration any further.

 

[MGD420]

Since they’re autos (I forgot), I wouldn’t reduce the duration any further.

Thanks. What about light intensity, before they were under 1 light at 100%.
Would I be better running the 2 lights at 75% as they are now or dimming them slightly for a bit

 

[FelipeBlu]

I like the idea of two light sources. If the plants are shutting down after 16 hours at 75%, I’d leave it there for now.

 

[MGD420]

I like the idea of two light sources. If the plants are shutting down after 16 hours at 75%, I’d leave it there for now.

Ok, thanks. I'll keep them at 75%.

My last grow there was only 3 plants in a 4x4 for the first couple of months they were under 1 light the remainder they were under 2 until harvest.
As much as I would like to save on the electricity bill I'm with you on the two lights are better than one, especially now there's twice as many plants as last time.

 

[FelipeBlu]

They’re looking terrific BTW!

 

[MGD420]

Thanks FelipeBlu. Also thank you for the help.

The tallest one that looks to be the furthest along, showing more pistils is the barneys farm pineapple express. That was germinated nearly two weeks after the majority of them.
Hopefully they do well and give good yields. There's another 2 plants over in the far right corner next to the fan but they're only a few days old.
Not sure if I'll put the 2 small plants in big pots and try grow big plants or if I'll keep them small and tinker about with them.

After this lot are finished though I'm considering at the beginning of next year growing 2 auto's, turning one using colloidal silver and pollinating the other with the pollen. As far as I'm aware doing it that way creates feminised seeds. Is that correct ?

 

[FelipeBlu]

After this lot are finished though I'm considering at the beginning of next year growing 2 auto's, turning one using colloidal silver and pollinating the other with the pollen. As far as I'm aware doing it that way creates feminised seeds. Is that correct ?

That’s definitely out of my lane - but there are lots of fantastic growers on here - just post a question if a search doesn’t give you the results you’re looking for.

 

[bluter]

the drooping is totally normal. it means they've had enough ppfd. also indicates a good rig and / or decent penetration.

it's the opposite of praying, they reach up in the morning when they wanna go, they chill down in the evening when they wanna ease off.

if you use supplemental lighting, now is the time to run it. you can extend the day cycle without running a full rig and get your deep blues and far reds in for veg and flower. it's part of why i run the 5050's on my little veg rig. also why i need to add the reds on the flower rig.