I culture and dose live phyto and zooplanktons for my gonioporas so I try to minumize the excess nutrients in the water column with the carbon, I still use my skimmer, the mangroves in mud and the sixty pounds LR rubble/bleached coral skeletons. I guess you could say that I'm "catering' to one specific species of coral, but I've been successful with the very first goni I purchased going on seven years ago- it was an itsie bitsie golfball sized frag when I bought it and now it's a good vollyball size ...I must be doing something right. The two bottles have ro/di with trace elements- one for misting the mangroves and the other stream for salt creep. TinMan