So I added a smaller piece of mopani wood to my tank after boiling for an hour and half + rinsing, and now few spots have this clear, hazy slime covering it, half inch high in one area. From what I gathered online its called "ghosting" and should be harmless. It looks like a bio film, or maybe fungi? I assume its harmless and the shrimp/snails may eat it, or the microorganisms will. Does anyone have any experience with this, and ultimately, is it safe?