I've had my 75g for 18 ?months, I used all base rock, phosphates at .02 with measured with ultra low hanna checker, 0 nitrates, mag 1320, KH 8.4 Ca 390, 1.0245 SG. Initially I didn't have any of this white snotty stuff on my live rock, but lately its been very annoying, it is not an eye sore because its mostly transparent so you can't really see it unless you are up close, but sometimes it gets in between my zoas and corals. Originally I though it was dying Hair Algae, but it just appears without there being HA first, I do have some HA atm, but very minimal.It feels very snotty to the touch, and it doesn't pop if you touch it, but any light scrubbing immediately dislodges it. It seems to grow pretty fast and it only grows under lights, shaded areas have none. Here are some pics, including a tank shot:http://i68.tinypic.com/69expc.jpghttp://i66.tinypic.com/242adzl.jpghttp://i65.tinypic.com/11cb3py.jpghttp://i66.tinypic.com/24cy0p5.jpg