Algae???

Ok...so I have had my 55 gal running for almost a year and has been running perfectly untill about a month ago. I did as much research as I could before I started, bought an RO/DI unit that has tested to be working perfectly, and I am very consistant with bi-weekly water changes. I test my water weekly and it is always perfect on all levels including phospates and silicates. I have a protein skimmer, custom refugium, and a canister filter that runs activated carbon and "harmful element" removing filter flosses. My temperature runs an average of 79 degrees and does not fluctuate much. The tank is about 20 feet from an east facing window that gets no direct sunlight and has constantly closed shades.

My problem seems to be some sort of Cyno. However, this stuff likes high flow AND low flow areas, grows quickly in long stings, and is all over EVERYTHING. It grows on my corals, on my FISH, and takes root in my sand bed. I moved most of my corals out into the hospital but am waiting for my second hospital to cycle before I can get ALL of them out. Alot of them, I moved to the refugium because there is far less of this CRAP in there. My hospital tank uses the same water but everything is perfect in there.

I have tried syphoning it out...comes back in a matter of hours. I tried a sea hare...couldn't keep up with it. I turned the lights off for 3 days...put a dent in it, but it came back within hours. I tried red slime remover TWICE (with my biological filtration removed and skimmer off)...It got worse. I have limited my daylight time to 6 hours from 8...still nothing. The light is also fairly new and of good quality.

Picture...you can see one of my zoanthids closed up there...:-(



So..anyone?