Thanks! Sometimes I'm not sure if it was a good idea or not, as it limits my flexibility (i.e. suction cups don't stick) with equipment placement. But overall, it definitely lends a more "natural" feeling than other sorts of backgrounds, especially, as you say, in this style of scape.
I do want to start an Iwagumi style tank at some point, in which I think this type of background would not work.
Anyway, thanks for the comments - I enjoy reading them.