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GE 'Sundust' loves to be crowded in a pot, so unless it is over the sides, or breaking the pot or you want to divide it, I'd wait to repot it. Generally about 3 years or so for most media is the life before repotting is needed.
Cyms will grow in lots of different media. I use a mix of bark, coconut husks, and perlite. This works for me because of what i have that I can use. Also I add some dolomite and gypsum to the mix.