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Boys and girls, I hate to disagree and I could still be wrong but that looks identical to a trumpet coral when it's not extended. Here is a pic of a Duncan
And now a picture of a trumpet . If you notice the closed up trumpet on the left, it looks very similar to your pic.
It looks like a closed up Duncan. The little heads growing on the side seem to me that its a Duncan. Also the amount of flesh. Op has it opened up at all?
It is most definitely a duncan. Trumpet coral aka candy cane has a plain non tissue skeleton where as duncan has tissue covering its skeleton typically being green in color.