Regular or activated carbon?

[BRFishman]

Which is better, regular or activated carbon, for a 20-gallon saltwater tank?

[seabass]

Welcome to Nano-Reef.com.  What do you mean by regular carbon.  Carbon as a chemical filter media is always activated carbon.  It adsorbs meds, dissolved organic compounds, reduces odors, and makes water clearer.  Chemical media isn't always required, but many people do use it regularly.

[BRFishman]

Replacing charcoal (and other stuff) in a Fluval C-3 filter and the online catalog has regula and activated charcoal bags.

 

[seabass]

I believe that this is the catalog: https://fluvalaquatics.com/us/product-category/filtration-media/media/clip-on-media/c-series-clip-on-media/

 

Could you be more specific about which two media packages you are comparing?

[BRFishman]

Replacing charcoal (and other stuff) in a Fluval C-3 filter and the online catalog has regula and activated charcoal bags.

Thanks. I'll just go with activated.