I have no idea

[SevoInduction]

Anyone know what this is? I thought maybe Aiptasia at first, but my peppermints took care of all the Aiptasia I had within 6 hours of putting them in the tank. They leave this thing alone..

 

[redsea reefer]

Button polyp(Palythoa) or Majano

 

[Jess]

+1 button polyp

 

[BigAl07]

I think they are probably correct. .. . Button Polyp (aka Palythoa)

Button Polyp - Palythoa sp.

 

[SevoInduction]

Thanks everyone! Yep, looks like a Button polyp from the pics I've looked at..