Yellow spots on leaves

[Fortuno]

My girls are in 5th week of veg, they've been growing nicely, I started manifolding them. 2 days ago I increased light output because they were getting bigger and some fan leaves were in shade.

The next day I noticed that on one plant fan leaves curled up and there were shiny, light green spots on them. I immediately dimmed the light and increased the distance to my plants because I thought it's lightburn. Since then the spots got yellow.

However, now I'm unsure. Only one of 2 plants is affected and curled leaves and yellow spots are only on older fan leaves. New growth looks healthy and my other girl is also ok.

Maybe it's some nutrient deficiency? I'm using BioTabs nutrients. Any help is appreciated.

[Canuck147]

Looks to me like calcium/magnesium deficiency.

I'm wrong - soOrbudgal looks correct. Zoom in and definitely looks like something munching on the greenery.

[SoOrbudgal]

For some reason to me it looks like bug problem because of how it's shredding the skin of the leaf ?

[Eliot Pryor]

Me thinks SoOrbudgal has nailed it. Check the backside of the leaf. Good luck !!

[Greengringo]

Wow..would like to know what kind of bug does this sorta damage that quick? ..so my question to you@fortuno is..from when you started noticing the damage to when you took these pics was how many days?..

[Fortuno]

Yesterday evening I noticed some shiny, light green spots. The pics are from today.

[Greengringo]

@fotuno did you look under the leaves to see if there's any movement or black spots like others already mentioned

[Fortuno]

For some reason to me it looks like bug problem because of how it's shredding the skin of the leaf ?

I checked the other side of the leaves. Can't see any bugs there. I took some pics. I can definitely say it's getting more yellow but there are no new spots as far as I can tell. I'm kinda scared by how quick it's changing I'm also adding pics of my healthy girl for comparison, she seems unaffected.

Edit: The most affected leaves feel a bit like paper to the touch, unlike healthy ones which are elastic.

[SoOrbudgal]

Did you look with a jewelers loupe magnifier? Can't hardly see them tiny white specks or tiny black poop

[Greengringo]

Do you spray the leaves with water or foliar feed your plant.

[Fortuno]

No, just ph water to the soil. I use BioTabs set according to the instruction - you add tabs the to the soil at the beginning, mix in some mycorrhiza fungi and good bacteria and then just water the plants as needed. There's also liquid nutrient to add in 5th week of veg but I haven't used it yet.

[SoOrbudgal]

Dang paper thin leaf sure sounds like something is munching hmmm perplexing. Yes I would just be doing water till this thing is figured out.