Planted Tank Guru
Join Date: Dec 2004
Location: Churchton, Maryland
I guess you could try to place some moss in the bare areas after a trim, I bent a paper clip and use it like a Crochet needle and just pull a little through. My wall doesn't even come close to how nice yours is but I have some growth popping out of the water so I think it's just a matter of time before yours will fill in, plus I don't have CO2 in that tank.
BTW That was a great idea and if you document the next one and place it in the DIY section it will become the standard method, the gutter guard lets it so much light and flow the moss grows much better than other methods.