The tank has been up since the beginning of the year.(Jan. 3, '07) The coraline growth took off very fast from the get go and hasn't stopped. I think it has something to do with the spectrum of light from the VHOs because my buddy has a tank with halides and his coraline growth is nowhere near mine and the lighting is pretty much the only difference between our tanks. It grows so fast i have to scrape the front and sides almost every week to keep them clear. The back glass is completely covered with coraline and the rock is about 90% covered. I'll post some full tank shots soon.