A long time ago the reef-keeping hobby separated the stony coral world into two broad categories. These categories are small polyp stony corals, or SPS and large polyp stony corals or LPS. Are these labels still helpful today?
Check out http://www.tidalgardens.com for information or if you want to buy corals for your reef tank.
Check out Tidal Garden's sister site Advanced Reef Aquarium reef-related goodies: http://www.advancedreefaquarium.com
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