I'm currently running Chemi-Pure Blue in my 20g nano, but will be switching to carbon only in the next few months (after i've exhausted the last of my Chemi-Pure Blue)
I like carbon as it really clears the water of any yellowing compounds and for me having a mixed reef, helps absorb some of the "chemical warfare" that can happen. I've personally never noticed any negative effects using carbon - only I have seen is if someone uses too much too fast or too much of an an aggressive variety (ROX 0.5 in large quantities). If you use a proper amount for your tank, it is only beneficial IMO.
I'll be switching to the Aquaforest carbon as it is larger pellets that work slowly and doesn't exhaust as fast. No shocking the tank.
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- Jordon
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