Normal i think
We had a common knobbed starfish that did this all the time. He'd invert his stomach on the glass, looked alot like snot, green and slimy.
dont know if this helps, we still have the starfish that does this and he's doin fine
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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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