sand turning black

powdertang05

New member
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

In Memoriam
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

New member
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

New member
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.
 

AZDesertRat

In Memoriam
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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