I've got a whole bunch of ReefSpec Carbon and I drop a bag in for a few days then pull it to keep the water clearer. I do that every couple weeks.
I was using "Chemipure Elite" on the frag tank, but I think it contributing to the tank being too clean. But I might use it with the larger tank.
The RS Reef Spec Carbon gives you a pretty good bang for the buck as all you need to use is 50-60 grams every 2 months for a tank your size.
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