what you are describing sounds a lot like brittlestars. They stick their tentacles out of holes and what not out of the live rock, in hopes to grab some food floating in the water column.
i too see a mass amount of arms waving now when I feed the tank... quite neat.
thats my guess too though... brittlestars
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20g BB Mixed Reef // Coralife 150w HQI // AquaC Nano // Koralia 1 & Seio 820 // Jager 200w // AC50
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