Plerogyra vs Physogyra bubble coral

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dragonfisher33

Aquarium Advice Addict
Joined
Apr 8, 2013
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Atlanta, GA
Can someone shed light on the different between these two bubble corals? for some reason one is referred to as bubble coral while the other is referred to as pearl bubble coral and my research came up nothing. how are the bubbles and septa different from one to the other?
 
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