I have no idea where I got the photo from, so I have no one to ask and no way to get a larger photo. I just figured a possible ID could be made from the growth pattern and general shape that the moss seems to have as a clump.I'm no moss expert. If you can't get a larger image, maybe where you got the pic from has a flora list that states what moss was used? Or ask whoever the tank owner is.
Yes, the moss in the back has that general shape.Looks like mini pelia but I could be mistaken
That could very well be an accurate ID, as the moss on the back rock is a different green than the moss on the front rock.Looks like fissidens in the front and pellia in the back.