Mr.Fishtank
New member
Usually I have in my Sump the coal, which I change every 15 days. I'm using Aquaforest "Component 1+2+3" is correct using constantly the coal in Sump ?
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If your referring to the GAC then yes you can have it in a media bag placed in the sump. If this is you first time using GAC I would start with 1/8-1/4 of the recommended amount to not strip your system too fast.