Sites with pictures and/or information on SPS(small polyp stony coral) and LPS (large polyp stony coral), soft coral, leathers and more.
http://www.marinelifephotography.com/corals/corals.htm
http://www.livestockusa.org/CORALS.html
http://coralidea.com/sps.html
http://www.marinelifephotography.com/corals/corals.htm
http://www.livestockusa.org/CORALS.html
http://coralidea.com/sps.html