Yea!\r\n\r\nFigured as I would start my own. I am about ready to pull my last hair on my head out over this, so help would be greatly appreciated.\r\n\r\nFirst, what I know (from liquid kits or other more specific tests):\r\n\r\npH: 7.8\r\nKH: ~250\r\nNitrite: 0\r\nNitrate: 0\r\nsg: ~1.26 (refractometer)\r\n\r\nOther good stuff:\r\n\r\ntank size: 75g\r\nlighting schedule: 1 hour of blue/moon, 10 hours of blue/white, two hours of blue, 11 hours of darkness.\r\ncirculation: 2 aqueon 500's\r\nSump: yes (return at 750-1000 gph; can't determine exact model, but know this is the range)\r\nlive rock: 20 pounds in the sump, 70 pounds in the tank.\r\nClean-up crew: what reef cleaners recommended; I've got 120+ snails of various sorts.\r\nTemperature: 78C\r\n\r\nCritters: mushrooms corals, one damsel, one clown, 120+ snails\r\nwater: ro/di still testing by tds, which reads 0. Yes; I've calibrated the TDS. Initial fill and top offs by same ro/di. \r\nSalt: Instant Ocean\r\n\r\nI've got nice bright white sand that I can't see. I can't see it because it's covered with cyano. Literally. Every square inch. \r\n\r\nWould now be a good time to point out I am obsessive compulsive this this compeltely sends me over the edge? :frustrat:\r\n\r\nBlackouts and repositioning the circulation pumps won't do a darn thing to this. I've done three blackouts of 3-4 days each over the past two months. Nothing. Still there, maybe got a 50% kill the first time I did it at best, less every time there after. I've had this for about 3 months and can't make a dent in it. About 30% water changes after every time I did a blackout.\r\n\r\nMy first step was reef cleaners to get a proper cleanup crew. That was a month ago. No blackouts since as it stopped working. I've been cleaning out by hand and performing ~30% water changes. No improvement in the cyano,\r\n\r\nMy next step was to setup a phosban reactor. That was two weeks ago. No improvment in the algae. \r\n\r\nSo here I sit. Those of you that remember, will know I hate my skimmer. I think it's complete bullox. \r\n\r\nAs far as I am aware, this type of algae feeds off nitrates/phosphates/flow. I've fixed the phosphates, and flow should not be the issue. \r\n\r\nThat leaves the nitrates and the skimmer. I don/t trust the nitrate or phosphate tests due to the algae problems. I'm being given false excellent readings here and I know it. \r\n\r\nMy skimmer won't even produce a cup of skimmate every month; and that is when I did blackouts and had massive algae kills as a result of it.\r\n\r\nI ma getting a little nervous at continually throwing money at this trying to find the root cause and continually failing. At this point, I want to say it's the skimmer, but I really want to make sure before I throw a few hundred more at the problem.\r\n\r\nDue to size problems with my sump, I am looking at a Reef Octopus hb2000. I would really like an in sump, but this sump is a custom build and I can't find anything that will fit. \r\n\r\nThoughts, ideas suggestions?\r\n\r\nThanks in advance!