Hey there, bro! This looks like signs of a parasite, but besides that, the veins in the leaves are red, and the plant is having trouble accessing phosphorus. It's time to stop using grow nutrients and only use bloom. For parasites, there's neem oil; it's used as an antiseptic and antiparasitic. 👌 Getting rid of parasites will require multiple applications, from 3 to 10 times. They won't back off after the first try! 👌😇👍 Good luck, bro!