coral id

There are two types (maybe more) of hydnophora - encrusting and branching. From my experience they both look a lot alike in terms of they are very green with "fuzzy" brownish polyps when their polyps are expanded. Here is a picture of ours (the branching kind). Do the polyps look like yours as it sounds like yours may be encrusting since you are describing it similar to a plate?

DSC_0048.jpg
 
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