Black sand?

[FlightRisk]

I have a 29gal tank with about 2" of sand and 8lbs of live rock. I'm not sure if this is a problem but there is quite a bit of black sand right under the top layer of sand, I have been mixing around the sand to try to get rid of it, is this ok? Or should I just leave it alone?

[reefrunner69]

Is it actual black sand or is it a black line or has the white sand turned black?

[RogerMcAllen]

Did you add black sand to the tank, or is this normal sand that has turned black?

[FlightRisk]

It is white sand that has turned black. Is it a bacteria?

[reefrunner69]

It is more than likely an anaerobic line marking where your anerobic zone starts.

[FlightRisk]

Sould I stir the sand up?

[reefrunner69]

I stir my shallow sandbed about once per month or so, I actually clow water into the sand bed with a baster, removing any detritus from the bed.

[FlightRisk]

Thanks