Anyone tell me what this is?

I'm 3 week in veg and haven't been feeding much nutes was honking is this bug bites or a defiancey !!?????...

Being between the veins it looks like Mg def. But, it looks a little crispy with defined edges, not as faded as Mg def usually is. Ph problems have blotches with crispy edges like that.

What soil and food do you use? They look a little dark green like you might be overfeeding. Sometimes defs like Mg will look like other things when there is overfeeding (salt buildup in the soil). You're kind of early in the grow for a problem like that. It usually arises in transition, or early flower.

az2000 said:

Being between the veins it looks like Mg def. But, it looks a little crispy with defined edges, not as faded as Mg def usually is. Ph problems have blotches with crispy edges like that.

What soil and food do you use? They look a little dark green like you might be overfeeding. Sometimes defs like Mg will look like other things when there is overfeeding (salt buildup in the soil). You're kind of early in the grow for a problem like that. It usually arises in transition, or early flower.

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I use Dutch pro all mix and bio bizz feed, I'm in 18l pots now and give them 700ml today I think it could be under feed could be wrong but I repotted from 11l which I was giving only 500ml so I don't know haha??

I'm not familiar with that soil or nutrients. Maybe others can comment. (Or, you could ask in the general->nutrients forum what people normally feed).

If you think you're underfeeding, then I'm inclined to say it's Mg def. I would add 3/4 tsp/gal epsom salt to the next feeding. (That's about 2ml/L, I think).

Do you ph your nutrient mix? (I don't ph my soil. I don't think you have to. But, just curious if it's possible your ph is off.). Do you have an EC meter? (What's the EC of your water? And, the EC of your runoff? That would be useful info.).

i was told with the dutch pro you want to use a good amount of nutes. what was you feeding the per gallon?

look for bugs underside leaf

have you misted the plants ?

Like thumper said, that appears to be pest damage. Post a photo of the underside of the leaf.

thrip damage or residual from foliar feeds