They are harmless, i have at least 5 or 6 in my rock,they come out at night and look for food. My sixline likes the pester them, I'd be more worried about your fish killing them then them killing your fish.
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135 gallon reef
corals:kenya tree,colts,blasto,gold toadstool,gps,zoo's,ricordea,elephants ear,rhodactis mushrooms,finger leather. 7 inch squamosa.
Livestock: powderblue tang,scopas tang,sailfin tang, blue tang, longnose hawkfish, coral beauty,2 clown fish,royal gramma,checkerboard wrasse, sixline wrasse.
soon to running 55 gallon refugium.
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