New to the site, not new to salt tanks. Only ever had fish with live rock... I got this at the LFS yesterday, floating in a tank filled with tangs. I also got it for free. I have no idea what it is at all, So I took some of my reef glue, and stuck it to my live rock, What is it, I love it whatever it is, what will it do how can I take care of it ?? It opened up over night and it looks pretty cool to me please someone or everyone advise me on what I got