License to krill

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Looking at the range of it I see why it's on the threatened species list, because it's only around Florida, so much like Bangaii cardinals they're threatened because they don't exist other places.

That said I wonder if it's a non-photosythetic filter feeder, just by the shape of those polyps looks like they're primarily grabbing stuff out of the water column, are there any NPS branching stony corals though? I mean I know sun corals make a hard base.