Here is my 58 gal with a 20 gal sump sps reef that has been set up since 2008. It is lit by an ATI Sunpower (36")T5 6 bulb fixture.
I have run GFO and carbon since the beginning even at half the recommended doses and finally took the GFO reactor off line, for about the past year and a half, and feel like the colors aren't washed out like it has in the past. I felt like I was starving my sps. My nitrates and phosphates always measured at zero...which I feel wasn't a good thing. Zoas would shrivel up and disappear and chalices never looked colorful. Now I run my tank dirtier than before, not to mention I only do water changes every 3-4 weeks. As for carbon, I use it passively in a bag in my sump. Now I feel the colors look good.
I have run GFO and carbon since the beginning even at half the recommended doses and finally took the GFO reactor off line, for about the past year and a half, and feel like the colors aren't washed out like it has in the past. I felt like I was starving my sps. My nitrates and phosphates always measured at zero...which I feel wasn't a good thing. Zoas would shrivel up and disappear and chalices never looked colorful. Now I run my tank dirtier than before, not to mention I only do water changes every 3-4 weeks. As for carbon, I use it passively in a bag in my sump. Now I feel the colors look good.
