"dust" in refugium

[Kimi]

I have notice a light coating of "dust" in my refugium. I don't know what it is, if ist is good or bad, or what to do about it. It is very light in color a tan to gray and is very fine. Any advice would help.

 

[bradbmbj]

Probably just detritus, blow it off with a turkey baster or small powerhead

 

[noahm]

Probably some water in there would keep the dust down