So on my frag of green nepthea/sinularia whatever it is, I noticed at the edge of the frag plug a dark brown/black swirl that literally looks like soft serve ice cream or a cartoon poop. I thought that's what it was, maybe my clowns feces stuck to the plug or a dead worm or something. However, I just watched it grab some expelled waste from my coral and eat it/pull it into the top opening of the poop. Sorry I can't take a picture because its so small and my iPhone blows for taking in tank pics. Anyone know what this swirl like poop color thing is??? Thank you