This tiny speckly white stuff is appearing on the soil of a micro. Could it be some type of mold? Repotted the end of June, the plant is wicked with 2 strands of a medium 4-ply acrylic yarn, the potting mix is lightened with perlite. I don't think the mix is kept overly wet though I'm not positive. The white stuff can be seen on the soil on the left edges of the plant. I dilute the Optimara fertilizer mix by half for the minis. Any thoughts you have would be appreciated. Should I be concerned you think? Thank you!

~D