Also, when gluing the frag at an angle parallel to the light, you are greatly increasing the light captured by the coral. keep in mind that is the photosynthetic activity of the embedded xooxanthellae algaes that are responsible for most of the corals growth. When the coral is straight up and down, light capture is greatly minimized. Also you may want to check out garf.org sps propgation pages for excellent pics and descriptions.