Well to put it in a nutshell an LPS is a large polyp scleractinian(stony coral) like bubbles,elegance,trumpet,galaxy,flowerpot,etc
SPS are small polyp stony corals like Acropora, Seriatopora,Stylophora,pavona,Hydnophora,Porites,Pocillopora, etc
they are charactorized by prominent branching calcerous skeletons covered with very small polyps
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Reef as though your life depended on it, yours does'nt but the sea's does.........Doug ReefCentral/ReefTank moderator