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powdertang05
09/06/2006, 04:40 PM
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.

AZDesertRat
09/06/2006, 06:21 PM
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.

powdertang05
09/06/2006, 10:04 PM
i have 700 gph from a mag into a sqwd in my 40 breeder the sand depth is 1-1.5 and i have about 25 hermits and 10-15 snails ,2 turbos.

powdertang05
09/06/2006, 10:06 PM
sand in my tank is more for show really 75 lb of lr and 20 rubble in sump. water changes ever 2 weeks water is premium.

drummereef
09/06/2006, 10:31 PM
Is is black on the top layer or can you see black pockets deeper into the sandbed? A pic would help too.

AZDesertRat
09/06/2006, 10:38 PM
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.

CPT. MURPHY
09/06/2006, 11:01 PM
Any pics?