there is this stuff that keeps developing on the soil. its this white sorta powdery stuff that appears to be mold. its not on the plants at all, and im not sure its actually mold. it sorta developes on any protruding little stick or clumps of dirt around the top of the soil. im wondering how this will affect my girls in the future, and what can be done to get rid of it. they are still veggin by the way.