It'* hard to tell, but it looks like you're on the absolute low tension mark. See that little arrow on the aluminum casting above the scale on your tensioner? It should be pointing to the lines on the other end of the scale.
I changed the whole tensioner as it was rattling. and when looking at it from the front you could see it moving slightly to the left and right. So far I still have the stock pulley on it. no adjustments....yet.