I would say that something has been introduced into your water. Have you been using Reverse Osmosis DI water. Have you checked your TDS readings of your make-up water? Have you changed the type of food you feed or feed to much perhaps? Is your skimmer producing good dark skimmate. Thousands of people use Instant Ocean, Its probably the number 1 selling brand. I dont use it but I have in the past. it will not cause a algea bloom just using it. How did you change your lighting? I always replace all my bulbs at the same time without any problems. Do you have a refugium?
Just trying to help you look at other things.
Jay
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60 Gal Acrylic, 30 Gal Acrylic, 55 Gal Glass.
Remora skimmers, 440 Watts VHO URI's. Mag canister for carbon. 90 Pounds liverock, 100 pounds live sand DSB, Flame Angel, Coral Beauty, Clown Percula, Royal Gramma, Domino Damsel. Pulsing Xenia, Devils Hand Leather, Frogspawns, Torches, Hammers, Fox Corals, Gorgonias, Various Zoanuthus, Favietes, Toxic Green Star Polyps. Candy Cane corals, Purple Indica. |