The new 120-gallon reef tank is doing well and I've added all the fish I feel prudent for now (2-Yellow Tangs, 1-Lamarck's Angel, 2-Maroon Clowns, 2-Ocellaris clowns, 2-Neon Gobies - about 20 inches total length in all and growing.) These fishes are fed at least 3x daily with frozen mysis, live adult brine shrimp and nauplii, frozen 'meaty' fish foods, an algae-based frozen food, two types flake foods, two types pellet foods. Nori seaweed (attached to a clip) is added in the morning for the Tangs. About 25 coral fragments have been added. These are fed ReefRoids and a similar product from Germany (Fauna Marin). These are soaked in Selcon, coral feeding stimulator and amino acid supplement from Polyp Lab, and a VitaChem product. Since some of the corals I have are omnivores, I add at least 250 milliliters of phytoplankton daily as well. This is added several times a day. The Goniopora specimens are growing as are all others - there are also some feather-dusters that arrived on the live rock that are demonstrating good growth. Since the protein skimmer would remove the phytoplankton, it is on a timer and runs only at night. I was concerned that nitrate and phosphorus concentrations would spike using this routine but to my surprise their concentrations have dropped to the lowest levels seen in this tank. I speculate that the phytoplankton mops up nutrients during the day and those not consumed are removed by the protein skimmer at night. I should add that I use a Hach colorimeter and EPA-approved reagents. Nitrate is reported to a tenth of a part per million (presently 0.7 ppm); Phosphorus to a hundredth part per million (now 0.02 ppm.) I can't state absolutely that the phyto addition is responsible and it could be coincidental that nutrient concentrations began to drop when phyto additions began. But...