If your talking about the fuzzy stuff to me it just looks like detritus. I got some bad rock and I would blow it off then a day or so later it would be back. Try testing your water for phosphates with the light out at night after its been out for a few hours. If the tanks new, and you got the rock second hand sometimes it has a pretty bad build up of crud in it.
Mind you I could be 100% wrong and it could be something else. But to me it looks similar to what I had before I started getting green hair algae problems in my tank. Hopefully others will chime in with opinions
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I'm not 'fallow' you must be talking about my tank!
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