what is those spots ?

Thrips.

White spots on cannabis leaves are generally caused by a fungal disease, known as white powdery mildew. This disease is characterized by the appearance of fuzzy circles on the leaves of the cannabis plant. The most affected leaves are usually the lower ones. If you catch this early, you may be able to do something about it. However, as the white powdery mildew spreads, the spots will get much larger and turn into big circles. The mold will then spread to other parts of the plants, making it harder to deal with. Apart from white powdery mildew, there are also a variety of pests such as aphids and spider mites that can cause white spots on cannabis leaves. If you see white spots without any insects present, it is most likely a white powdery mildew problem. To prevent and treat white spots on your cannabis plant leaves, it is important to ensure proper air circulation around the plants and provide adequate light. Additionally, maintaining optimal humidity levels is crucial, as high humidity can promote the growth of mildew.

prolyl bugs.. get ascope out and check under leaves... "pyrethrines" based pesticide will kill on contact if oyu see any. perfectly safe to use in vege as it is not systemic (does not enter and stay in plant forever... it breaks down within 72 hours) it's a kill on contact, not a residual effect. when combating a pest infestiation always good to kill at various stages of growth at same time if you can. things that lay larvea in soil you can use Bti (mosquito bits or dunks is a brand name product, but the Bti bacteria is the key, not brand) -- **** not useful for thrips, but good info for future. this stuff can be used preemptively to avoid gnats and other nasty things in soil. if oyu buy substrate that is stored outside, it's best to use it preemptively. put some 'bits' down (top-dress) every 3 weeks or put a dunk in reservoir. sticky traps can help. from what i read thrips are more attacted to the blue sticky traps (more likely thrips in these pics than other things) predator bugs are an option.

Looks like thrips. I had critter issues in a dwc a bit back. I took out basket and soaked every inch of the plant with a neem oil mix. I waited a half hour then rinsed off plant good. I did this 3 times in a week. My critter issue was gone. I also treated the space and all other plants in the area. Look under leaves under magnification for them.