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I noticed this after putting my live rock in my new tank when I first noticed it was standing up Luke 3/4 of a inch tall and discharges waste or somthing. Here's a pic I've seen 2 of these so far.
if this is the video your talking about your right thats what it was doing and by the time i got the phone it was done. this is in my new tank but all the live rock was from my old tank so im glad im starting to see this life so quick