Which pests do this?

I think its a nitrogen surplus. Look at green shinyness and overprominent ridging in the leaves...

Guys, I do use Cal-mag on every watering. That's not the issue... I looked into the microscope and I think I have spidermites and wanted to get second opinion whether this type of damage is spidermites or some other pest. If this damage looks like nutrient deficiency, it's because mites are eating nutrients out of those leaves...

The "pest" is nutrient imbalance, I think you need a bit of calcium, maybe epsom salts (to lower degree), and to potentially lower ph slightly (if you do use calcium), I would recommend low levels ascorbic, citric and tartaric acids as options with that too (particularly citric acid). As usual, I can't be sure.

"Been using neem oil and insecticidal soap for a while as well, but this sort of damage persists still." These things, btw, don't necessarily have beneficial effects. They are typically negative (but used as a tradeoff, of bad vs worse). In your case, I would recommend you stop using both immediately, unless you can actually identify insect pests, yourself visibly.

It looks like either a calcium or manganese deficiency, but if you are under led and not supplementing with a calmag alike substance, Im sure it is calcium.

Leaves themselves are kind of yellow sickly color, not looking healthy green as well. Especially the top growth. Been using neem oil and insecticidal soap for a while as well, but this sort of damage persists still.