Did you mix your own soil? If you did it’s not ready yet so it may be too hot. Turn your soil some more and let it set a little longer.
You have a true living soil turn it every 5 days
Someone told me the white stuff was mold and to remove it that was before you replied and I did remove it...I have 2 different brands of soil in there #FoxFarm & #CoastOfMaine I also threw in a bunch of #LavaRocks & #RiceHulls
The rice hulls is good for air, silicon, and fungus when it breaks down. that is great for flower. I have never used Cost Of Maine before.