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Aren't barnacles fan shaped with many long appendages to grab detritus and are situated in an encrusted shell-type canopy that is permanently attached to the outside of live rock?
This has one single appendage that come out from inside the live rock which grabs around and picks up detritus to bring back in the live rock...what makes you think it is a barnacle?
Wiki:9
Barnacles are encrusters, attaching themselves permanently to a hard substrate. The most common, "acorn barnacles" (Sessilia), are sessile, growing their shells directly onto the substrate.[2] The order Pedunculata ("goose barnacles" and others) attach themselves by means of a stalk.[2]
Most barnacles are suspension feeders; they dwell continually in their shell – which is usually constructed of six plates[2] – and reach into the water column with modified legs. These feathery appendages beat rhythmically to draw plankton and detritus into the shell for consumption.[3]
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Brooke
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