I have 3 Elites over my 210G and I am very happy with them. As mentioned in prevous posts, this is an exceptional reflector for a 2x2 area, however, anything else and you will need a different reflector due to lack of spread.. Mine are mounted rougly 16'' from the surface. In a 30'' deep tank in the hotspot I am pushing 400 par on the sandbed. My SPS are getting slammed with light and they doing qute well.