help what are these white circles is it mould?

[kyle]

[UrbZ]

Looks like dried water/nute drops to me.

[DW2]

Howdy Kyle, Like UrbZ said, it could be the remnants (dissolved solids) left behind from watering. To be sure, get a loupe (60X or greater magnification) and take a closer look. If it is dried nutrients then it would appear crystalline, if it is a mold or fungus, then it would appear fuzzy or furry.
I hope that it is from a water drop. Good luck.

[Canuck147]

Looks like water drops - and why is there no perlite in your growing medium?

[Waltermelon]

I've personally never used any in mine... You don't have to use perlite with coco. It does look SUPER dry and in desperate need of some fluids.

[Sheesh]

Looks like salt residue from nutes to me too.