carbon? who runs it

[Delphinus]

I too run carbon 24/7. Big difference, I find. I use a couple tablespoons and change it out after 1-2 weeks. I run mine in a 304 cannister filter on the sump. In the past I've also just had it in an aquaclear. When you run it actively pushing water through it, it seems to be really effective, but you have to keep on top of the routine of changing it out and rinsing the filter bag since it tends to be prone to clogging.