Fellow Reefers, I have battled a major algea issue for 12 months solid now. I am at my ropes end with it. Tank has been established for 4 years. Until last Nov. I never had any issues with algae. NONE. In Nov last year over the holiday weekend my tank crashed. it is at my office and it sat 4 days without water moving. Fried everything. Lost about 6,000 dollars worth of fish and coral. So I started over. We got the tank cleaned up and let it stabilize over 4 months before adding stock again slowly. I loaded up my system with Apex everything to monitor and prevent any future crashes. I started to be GHA and got that under control Flunco 200. Then the cyano algae started and zapped that with Red Slime Remover. Since then I have been out of control with this algae. See pics. i have treated with Marine AlgeaFIX, Vibrant, bacteria, everything. Manual removal. UHHHH, its killing me. My water perimeters are good. Following: PH = 8.03-8.3 constant Salt = 1.025 Orp = 430 Alk = 8.4 ave cal = 400 Mag = 1500 no3 = 3 po4 = 0 Temp = constant 78.1 I had Triton test done and results were good. I was high on Bromine, Boron, Lithium. low on Iodine, molybdenum, Manganese, Vanadium, Nickel, and Zinc. All of what I was low on I bought the Triton elements and dosed as per their instructions. Not sure how to lower the few things I am high on. Tank system: 220 Oceanic Reef Ready 75 gal sump Quantum 220 skimmer Apex full monitoring system 2 Apex WAV running 100% on various schemes 3 Radion gen3 XR Pro 30 lights Chiller ro/di 3 stage with additional di cartridge Apex dosing alk, calc, mag, PHOLS xtra special, trace elements all dialed in hand dose vitamins, amino acids, algaefix feed every 2-3 days all frozen food, mysis shrimp 2 cubes, and one cube each of 4 different various coral foods, along with 1/2 teaspoon of reef roids and coral frenzy. Livestock is low for fish, only 7 small reef fish, 10 or so inverts, and the rest lots of sps and lps coral. Corals growing awesome and at rapid rate, but seems that the algae is starting to upset some of them. Let me know what you guys think my next step is? Im lost. Willing to try anything.