...I do not run carbon in our 90g...but I've since realized that isn't even necessary...
The necessity to use carbon in a reef aquarium will vary depending on the particular set up.
After reading the comment about putting carbon in your filter, i was wondering if i am doing the right thing. i have a rena cansiter filter and I always have carbon in my filter. Is this not a good idea?
Typically carbon is utilized for a particular purpose (improve water clarity, adsorbtion of dissolved organics, toxin or medicine removal, etc). Whether this is required for the tank depends on the set up. If you're using carbon 'just because', discontinue carbon usage and note any adverse affects. If there's no change in water quality or coral livelihood, carbon is probably not required in your instance.
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