Looks like mold?? I did a coral wall covered in mold with D/2 Biological and worked great. http://d2bio.com/

On 5/8/2015 6:13 AM, Dayron wrote:
Partners I have a rug brush for my 17" machine what type of brush would y'all recommend ( alkaline stripper looks to work well but if you have other suggestions please don't hesitate) 

 
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