Oh urm I don't know about the other kinds of goldfish, I was just passing on the info from the pinned topic in the coldwater section, have a read of that it might clear some bits up that I wasn't sure on!!
I was going for sand as i wasn't having a UGF anymore but my LFS dude talked me out of it and kind of glad, he said that it's alot harder to clean and shows up any mess very easily, so I went with this really fine gravel/course sand, I really like it!!
I have my tank all planted up now aswell, have a ook at my tank in the members picture section!!