i think this is in some ways a personal preference.. some people only run carbon for a week, then consider it done. I personally use my carbon for 3 weeks or so, giving it a rinse under tap water to remove particles and debris and such.... I would say don't use carbon anymore than a month though.. and if you do use it that long, make sure you rinse it well at least once.
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20g BB Mixed Reef // Coralife 150w HQI // AquaC Nano // Koralia 1 & Seio 820 // Jager 200w // AC50
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