I have three rics that attached themselves to a large shell on my sand bed. I like that I can move them if I want to but they are all the same color. I'd like to start adding to them so will have to keep my eyes out for some good deals. I also have GSP growing on my sand bed (away from any rocks). I love how it looks and its easy to trim back since I can literally lift the mat of GSP up off the sand bed and use a scissor to trim. So far its been well contained but I have a bit more room than you do. Anyway, your tank is definitely an inspiration for creating these small micro islands that are busting with color and texture. Keep up the amazing work!