So I'm debating my use of carbon in my sps dominate tank. So far I've been using 1 cup in a sump bag with 1 cup of gfo. Everything seems fine but I'm questioning if I should stop. I'm not Ulns or anything I feed heavy have a pretty good fish load and up until this week I've been using water from the lfs. I just got a spectrapure Rodi unit and will be setting that up this week as I have time. So with that said I will know positively 0 tds water I'm debating on saying good by to my carbon use. Thoughts?