Dr. Tim, I have had an issue with Dino in my 150 gallon tall. The problem was really bad about six weeks ago. I was told to increase my alk, keep my PH at 8.3 and do a five day black out. I did that, as well as get on a regimen of alternating eco balance and waste away weekly after the black out. The Dino is creeping back slowly. I can see some of the dino starting again on the glass and sand. My dkh is higher than it should be at 13.27, and the PH is 8.3. The rest of my parameters are; Ammonia 0, Calcium 448, Magnesium 1450, Nitrate .25, Nitrite 0, Phosphate 0.6, Strontium 4, Salinity 1.025 Temp 76.7. The test kits used are Salifert except for Nitrate Red Sea Pro, Phosphate, Calcium, Alk and PH are Hanna Checkers. I run a DIY LED fixture on an eight hour schedule, There is a sump / fuge with cheto set on an opposite photo period. As for stock I lost a couple of fish with the initial outbreak of dino so now I have a mated pair of yellow watchmans, a red scooter, cleaner wrasse, small royal gramma and a blue tang in a mixed reef setup. I skim fairly wet and do a 25 gallon water change approximately every 10 days. I feed rinsed frozen once a day. I run a dual reactor of GFO and carbon. I have some of your pearls and was thinking of buying a reactor and slowly starting pellets. I really don't want to use a blackout every six weeks as a cure / band aid. What can I do to fix this problem? Any suggestions you can give me would be appreciated.