Small white dots on soil

It looks like you could have a couple of issues going on. The soil appears to have white fuzzy mildew growing on the surface, which normally occurs when there are hot and humid conditions in the grow environment and mostly due to overwatering, it is an easy fix though. Simply scoop off the top layer of soil that has the visible mildew on it. Next apply an even layer of ground cinnamon it contains a naturally powerful fungicide that will terminate any remaining mildew fungus. I would let it completely dry out before watering again or if possible butt feed the plant (feed her water from the bottom of the plant by filling the drip pan or saucer with water instead of watering from the top) keep applying the cinnamon as needed until all of the mildew is gone make sure to hold off on the cinnamon once it is gone because you don't want to kill off any other beneficial fungus. The next issue it appears you have on the fan leaves is the beginning phase of powdery mildew, Trifecta crop control is a great way to combat this, however the same method as above can be applied as well, simply add ground cinnamon to water in a spray bottle and spray the plant down (be more liberal on heavily infected areas) until you no longer see the PM. You also will want to treat your tent as well because the spores from mold and mildew can linger on the surface of the walls and floors of the tent and re-infect the plants or get some sort of air purifier device/system. The key to prevention is keeping the environment at optimal grow conditions and have a hefty dose of air circulating throughout the tent. I hope this helps, good luck with he rest of your grow.