to make a moss carpet:
-buy as much moss as you need, it works best if you hae enough for the whole carpet at once. i reccomend java, taiwan, weeping, or xmass moss.
-get flat, thin small peices of slate to cover the whole area you wanted covered in moss.
-tie moss on slate
-place slate to fite together as closely as possible.
-wait a few monthes for it grow in. you will need to vaccuum the moss to keep it clean.
I'm having this issue in my 2.5 nano. It's a algae magnet
I think I'm just going to stick to keep the Moss on Rocks and Wood for now. I tied up alot of Moss to some stuff today. Wasn't hard at all.. I figured it would be harder since the Moss would float!