rust colored sand
I have a light layer and heavery areas of a brownish /rust color on my sandbed and on some rocks I think its cyno ??? any book or web site pics anyone can suggest and how do I get rid of it? a water change was just done a couple days ago and water tests show ok .
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only 25 gal & (6 bulb, t5's fixture & 30 gal sump with small fuge
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