I purchased some live rock a week ago, there has been some really interesting hitchhikers on the rock, including brittle starfish and feather dusters. But this morning when looking in my tank I noticed what I think may be apista, before I try to get rid of this I just wanted to confirm the id. I am very new to marine tank keeping, and looking at pic of apista doesn't really help as a lot of the pictures don't look like what I've got. Please help

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