Grey dots-normal or ? From

Some kind if bugs

Hey IQuSX! Those grey dots on the lower leaves are often a sign of early Calcium deficiency or, more likely, a bit of Manganese lockout if your pH has drifted slightly. Since you're using Silicon and Super Vit, just make sure your pH is stable, as Silicon can sometimes swing it quite a bit. However, if the spots look "fuzzy" or rub off, check closely for powdery mildew, but from the photos, it looks more like a minor nutrient/pH hiccup. Since it's mostly on the lower leaves and you're 4 weeks into bloom, just keep a close eye on the new growth to ensure it stays clean. Happy Growing, Growmie!

Thrips. It is not powdery mildew or any sort of calcium issue.

Likely thrips damage. Check undersides, add sticky traps and treat early (neem/spinosad).

Du hast Thripse Oder Spinnmilben.

hello I will explain to you as best as possible that in my opinion it is powdery mildew or Calcium deficiency If the spots look like fine flour powder that you can rub away with your finger, it's powdery mildew. This often starts on the lower leaves (“low floor”) where air circulates less well. ​Calcium / pH deficiency If these are small necrotic spots embedded in the leaf, it is often due to a blockage of Calcium. As you use Silicon, it can sometimes interfere with the absorption of Calcium if it is incorrectly dosed or if the pH deviates. ​ ​The lower leaves are the first to show signs of mobile element deficiency, but they are also the first targets of fungi because of stagnant moisture near the ground. ​ ​Finger test: Rub a stain. If it goes away, it's fungal. ​Solution: Increase air extraction, defoliate the bottom to ventilate this should be enough ​Check your pH: With a PH tester your pH must be strictly between 6.2 and 6.5 in soil (or 5.8-6.2 in coco/hydro). ​Remove the most affected leaves to avoid spreading if it is a fungus. ​ Monitors humidity (RH%). If it exceeds 55% at night at this stage (Week 4 Bloom), it is powdery mildew which is gaining ground. good luck and good luck

👇+1 for pest. To be sure, just place some sticke traps and check them after one or a couple of days. Depending on your findings treat for thripse/gnats e.g. growdiaries.com/grow-questions/91779-gnat-control Some methods work more or less on all pests (nematodes and bacterial treatment should be fitting for the pest)

Yea sure looks like pest damage 😬

looks like thripse damage