HELP! Don't know what this is!

My plants are about 3.5 weeks in veg, alien OG, under 2 1000w lights. I had a spider mite issue which has since been resolved, but now I have some blacks spots and leaves curling. Also leaves have a somewhat waxy look. Can't quite figure out what this is. Please help!

Did you use Neem Oil to address the mite issue?

Might Wash lights off, let them dry, rinsed with 6.2 PH water next day.

Have no experience with the product you mentioned. My first thought was N load up, but I'm not sure of the after effects of the insecticide is that you used.

I had a bout of N TOX this time around - Fish Emulsion is much stronger than I realized - and the leaves looked a bit like that at the onset. Then they rotted from the tips inward until I got it squared away.

When you say got it squared away, did time just fix the issue, or did you do something in particular?

A flush and time sorta fixed it, and I was very meticulous about feeding for 2 or 3 weeks. I made sure NOTHING I gave them had Nitrogen in it - including Cal/Mag. I couldn't find any Cal/Mag locally that didn't have any N so I decided to just give them Epsom Salt (for the Mag) while I waited it out.

To be honest, they never really completely squared away....they are in their 10th week of flower now and STILL have f-ed up leaves left over from the N tox in veg. They do recover enough to keep going though - at least mine did.

Thanks a lot pal. I appreciate the advice.

I didn't do a FULL BLOWN flush. I ran about 2 gallons through 3 gallon pots. It keeps the better part of a gallon in the pot then the second gallon flushes away a good bit of the toxicity.