If you're referring to the JBJ Nano Cube, I had ricordia in the original 12 gallon cube and a 24 gallon cube. It did great in both systems with the stock lighting that comes with the tank. I placed one quarter-sized frag in the tank and had dozens within 6 months.
As for expansion, I'm not sure if you're referring to the recording splitting or opening up... if it was originally under MH lighting, it may take it a week or two to adjust the the lower lighting. I've moved my rics between three different tanks. In each case, the lighting was slightly different and they took time to settle in and get comfortable.
In addition, make sure it's in an area with low to moderate water flow. If it's getting blasted directly by a powerhead, it probably won't do well.