What is on my haitian anemones foot?!

[marina2626]

I got this anemone yesterday and he seems to be doing really well. He has stayed open since I got him and has found a spot that he seems to like. This morning I noticed that he appears to have something on his foot. I have no idea what it is but assume it may just be poop? Can someone please help me figure out what this is?

 

[MERKEY]

Looks like mesenterial filaments, which usually means it wasn't happy on that area.