black dust on rocks,sand and on bottom of the sump

Discussion in 'General Discussions and Advice' started by SApicoreef, 14 Oct 2012.

  1. SApicoreef

    SApicoreef

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    hi guys

    i came home from boarding school for the weekend and found some of my rocks covered in black dust...then saw the sand and then in the sump.....i do run activated carbon on the tank....could it be from that?

    thanks
     
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  3. roderigo

    roderigo

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    Yes it could be that bud happend to me
     
  4. OP
    SApicoreef

    SApicoreef

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    how long did it take to clear up and what do you do about it to make it go away?
     
  5. roderigo

    roderigo

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    Well how do you run your carbon ?bag, reactor and how's the flow ?h
     
  6. OP
    SApicoreef

    SApicoreef

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    reactor and the flow is very high
     
  7. bollie

    bollie Advanced Aquarist

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    Didn't you rinse the carbon beforehand? .....its just dust, will disapear, cnt cause harm in tank
     
  8. roderigo

    roderigo

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    Ok that is your problem you should have a lower flow rate coz as the carbon is tumbling it is grinding on each other and making a fine dust
     
  9. bollie

    bollie Advanced Aquarist

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    Or you can just compact it in the reactor so it doesn't tumble:p
     
  10. roderigo

    roderigo

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    Also true
     
  11. OP
    SApicoreef

    SApicoreef

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    Will turn it down a bit
     
  12. Tobes

    Tobes Retired Moderator

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    What carbon are you using? Some cheaper brands tend to break up as well.
     
  13. OP
    SApicoreef

    SApicoreef

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    Not the bet carbon I've used but will swop it out in a week or so with some matrix or some rowa carbon
     

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