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Justin0329 02-23-2012 11:39 PM

White sand turning black?
I have white Fiji sand in my 55. Its really fine grain. Tonight while doing a pwc and vacuuming the sand bed, I noticed the sand below is turning dark. Almost black. My guess is that its not good. I stirred/turned the sand bed really well and did a large water change. About 50 to 60 percent. Any ideas what is causing this or if it is in deed a bad thing?

boardsurfer 02-25-2012 07:43 AM

Can you post a picture?

Megatron 02-25-2012 09:55 AM

What are your tank parameters?

boardsurfer 02-25-2012 10:16 AM

Btw, I wouldn't suggest turning up the sand. I would siphon it up with you pwc.

Rutrag 02-25-2012 10:23 AM

The sand below the surface is likely anoxic and will normally be darker. Stirring it may release some nasty stuff and actually might make you lose some beneficial bacteria that likes that kind of environment.

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