I've been using purigen for couple of years now in all my canisters, i don't use carbon at all any more, It's a PITA having to change carbon monthly. I like the fact you can regenerate purigen with bleach to new condition several times before you have to replace it. I would say forget the carbon and just use purigen. IMO
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Hey! I never "LEFT" the hobby, just doing fresh water now. Which is still listed as part of Canreef if I'm not mistaken. 
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