Ive kept a few types of corals under FL and they did great. Even better then under Pcs. I have a 10k and a 20k FL ( 40 watts each ) over my 75 and have kept a candycane, mushrooms, zoas, leathers, gsp, bsp, and others. All of them did great and had full color. They were under this lighting for 4-5 months. I thought they would start to die at 2-3 months but they did great.