Yep, use it all the time. I run it passively in a mesh bag floating in my sump, exchanged every month. Be mindful of the strength of the carbon, for example the ROX 0.8 stuff is easily twice as strong as a standard 'activated carbon', and you should thus use at most half as much.
Also something I do is rinse my carbon in RO first until clear and then soak it in HOT RO for 24 hours before using. (it cools gradually, and then is room temp for most of the 24 hours).
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Single System Setup: 210G SPS reef, 225G FOWLR, 72G water change, 50G frag, 120G sump. I promise a journal at some point! (anyone need some coral frags? I likely always have stuff that is frag-ready)
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