I don't think moss will grow on it, it needs to hold onto something and it'd just slip off the styrofoam. I tested it out, the best I could do is put up some mesh with pins but I didn't like the look of it so I took it down.
I was saying use some pins every few inches for it to attach to. Where there is a will there is a way.
My order of Flame, and weeping moss along with my needle leaf java ferns and a few mini marimo balls I ordered on 12/3 from aquatic magic, finally arrived after taking over a month. (they were in the mail since the 13th -tip dont order internationally thru usps during the holidays) Surprisingly they came thru alright, the weeping moss turned a bit yellow, but i think it will bounce back.
Still trying to figure out this new camera its a 12MP but i still cant work out how to get pictures much better than my old 5MP
not thinking before taking pics, I just fed em so my substrate is a bit dirty till they clean it up.
Edit: wow didn't realize my substrate was so uneven, gonna have to fix that
Hey did you get your shrimp yet? D&G had a bunch of red or black BumbleBee Shrimps for under $3 each. Or if you are really set on low grade Crystals, Aqua Imports has them, but they are $9... so you are really better off getting the Bumblebees or getting them shipped from a hobbyist.