Brown spots in Sump

Dinkin's Aquatic Gardens
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Do you have a picture?
 
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Top Shelf Aquatics
Likely mulm or sediment but pics under white light will be helpful with verification of what it is
 
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Saltwater Aquarium
www.dinkinsaquaticgardens.com
Avast
Welcome to R2R and the salty world. Hopefully the picture will bring some advice. Lots of knowledgeable and helpful people here who will support and advise you when needed.
 
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View ReefStash's latest YouTube video!
Hello @Capt502 and welcome to R2R!! Glad you joined us!! For some more advice on what to do about the brown spots, go to the New to the Hobby subforum especially if you consider yourself a beginner.
 
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