I have yet to get a carbon/gfo reactor for my tank and I am wondering how important it really is. I currently use a kalk stirer and my understanding is that will participate phosphates so I am also unsure f i really need to run gfo as well
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i would say that on a smaller system gfo and carbon are where it's at. for a larger system , carbon only just because running gfo would be really costly as you would have to use alot.
While I wouldn't go so far as saying that carbon is a must have, I will say that I personally wouldn't run a tank without it. I like to think of the carbon as a little insurance policy on my aquarium. With all of household sprays,aerosol, detergent, etc its a good idea to run carbon. I have gone periods without carbon, and I could definitely tell the difference. Oh, and let's not forget about coral chemical warfare. While I don't know that's its been verified scientifically, but most users with mixed reefs will tell you that it helps combat chemical warfare between soft and hard corals.
For as little as it cost, I don't see a reason why you wouldn't want to run carbon in a reef.
Sonny
I know it's a little late now, and this is just my opinion, but I use BRS' lowest grade GFO. Since I never have much phosphates anyway.. the lowest grade works well.
alright well I ordered the brs duel reactor along with the best carbon and gfo they had. and of course a pump. I have always been wanting one but when I do my test my po4 comes out around.25 which i felt was good. I do run a sps tank and recently added a 2nd mp40 and new lights because i see them living but not so much growing. perhaps the lack of a carbon and gfo reactor is part of the problem