sand turning black

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joshpwolf

Aquarium Advice Freak
Joined
Feb 10, 2012
Messages
304
Location
Pittsburgh, PA
I used pool filter sand as my substrate. And its starting to get a black color developing on it. Is this normal? Is there anything to do to fix it?
 
I used play sand in mmy 20 gallon when I first started saltwater and I had black patches. All my fish died. :/ never found out what it was but did decide not to use tht type of sand again.
 
I was told long ago it was due to silicates in the pool sand breaking down. I've never used it though so that's just what I was told.
 
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