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what was your source of water? sounds like you have a lot of iron in your water. i had the same problem when my water filter was full and i did not catch it in time it allowed a lot of iron into my system. the bacteria in the sand be binds it up then creates the black areas. something like this?



how do you get rid of the black areas? you have to remove the sand from that area. just stirring it will not remove the excess iron/hydrogen sulfide from the system, or at least not in a way that would be very healthy for the critters if it has truly become hydrogen sulfide.

some added reading from my experience with the black sand.

G~
 
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