Help me plz

[Deeznutzz]

Hi hope y'all can help me!
My auto green gelatos are now on day 28 they are looking good but I noticed some of the bigger fan leaves are showing some type of deficiencies but I don't know what it is
Im growing in coco/perlite feeding it Sensi coco A&B at 1.5ml per Liter
RH is at 55-60 temps 22° constantly 20/4 light
Feeding them once a day with plenty of runoff
Ppm in 680, out 680-90
pH in 6.8 out 6.1-6.2
R

 

[Dory]

Looks like you might need to add some CalMag to your nutes, those spots yellowish speckles look like calcium deficiency to me. I'm not an expert, hopefully someone else will pipe in. This pic show typical C deficient signs.

 

[Garage_Grower]

I think your main issue would be your feeds ph level. You want it to be 5.7-6.1 (5.8 is the sweet spot) going in with coco as it’s a soilless medium. Feeding at the current levels is locking out specific nutrients that can’t be used at that ph range.

 

[Deeznutzz]

I just realised that I typed in 6.8 ph in butt I meant to type 5.8

 

[Garage_Grower]

That’s right on the money then, what’s your water source? (Tap/RO?, and starting ppm?)

 

[Deeznutzz]

That’s right on the money then, what’s your water source? (Tap/RO?, and starting ppm?)

It's tap water about 300 ppm

 

[Deeznutzz]

It's tap water about 300 ppm

I havent been adding calmag cus my water is alrdy hard

 

[Dory]

I'm from a hard water area too... have never used CalMag, could be leaf septoria. Try taking the affected leaves off, check fans. Might need to take some foliage out to promote better air circulation.

 

[oldnewbdude]

If you didn't buffer the coco with any calmag and you haven't added any, I would try that first. Calmag is effectively absorbed from foliar feed too, if full strength would blow up your ppm.

 

[Waira]

It's tap water about 300 ppm

your total ppm's, that's including the 300ppm tap water? If so, then you are underfeeding,...
...the weird necrosis isn't a defc., at least I don't think... I never found a good explanation for that, but I see it occasionally here,... tissue dies and dries but stays green...
Other symptoms look like P defc. to me... Ca and P can look a lot alike sometimes, so Ca defc. isn't totally out but less likely all things considered...
Hard tap water may have Ca in it, but it's not necessarily available, especially if still in CaCO3 form, not ionized... the Coco nutes have prenty of Ca/mg in them already, no need to add more, just raise the actual feed ppm level, and stop with the hard water as is... dilute it down to 150ppm-ish with RO/DI/low ppm drinking water... Those self fill units are a great way to go on that!