ok ive been reefing for years now and in one of my tanks i just cant figure it out why is my sand black like moldy like. dont understand. please help me understand.
What kind of flow do you have, what does your clean up crew consist of and do you ever stir the sand?
You need lots of flow, a good crew and never stir the sand up or you upset the bacteria growth and run the risk of it going septic and killing your tank.
Thats not a tremendous amount of flow. A SCWD will cut the flow by 25 to 30% so you are probably closer to 500 GPH. Thats about 12x turnover for a 40G tank. I am at 36x turnover in my 100G and looking for more.
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