Reeftech Starburst Monti getting a green streak?

[Pife]

So I have had this Monti for several months. Everything in my tank browned out and is coloring back up beautifully. Over the last week or so I have noticed this spot on the Monti that is growing with the Monti. It is green. Now I know I haven't got perfect color on the piece yet but I'm wondering if the green streak will keep getting bigger? Sorry for the cell phone pictures.

 

[DSMpunk]

I wonder if it was grafted at some point. It looks like one of those green/orange mix caps.