I have ric's but they have not looked great as of yet. It is not the ric's since I know they split pretty regularly on their own.
I was more concered about the striped metallic ones. When I got the rock, there were 9 small ones on the rock, the biggest about 1" across. Now the smallest is about 2" and the biggest if 4" or so, and they are distinctly starting to cover eachother. I thought they would have split by now.
I also thought about fragging them to a new rock myself.