can we see a pic from the front of the tank with the moss in it? that last pic looks like the back of the tank?
edit* after looking at ur pics, it looks like u attached the moss to the back of the grid, so it would have to grow out and thru, that could be why ur took soo long to grow, i think attaching it to the front (or turning ur grid around) would have had much faster growth! but its starting to look good now! just make sure u dont over do the light cuz then u'll have to start using CO2 and ferts, (if ur not already)