soil surface

Hi im very new to Bonsai, Today i was sorting out my plants because mold had spread on the soil(cheap soil and bad circulation) and noticed my chinese elm bonsai (kept it inside), that i bought a week ago, had mold on the moss too (atleast i think it is mold??) but it looks very different than...

Whats eating my fert? Im not complaining, quite the opposite Its organic, plant based fertilizer in pellet form. 'Saidung plus'. Applied less than a week ago This pot houses an azalea but azalea roots are around 1/10th of a millimeter in diameter and these are like a 1/100th, I would guess...