Hi all. I'm in desperate need of help for my rubber tree that is growing too tall (about 3 feet tall) in an 8" pot (I think). I pruned it once last Summer and it stopped growing for a while, but started up again.

It's just growing too tall and eventually may topple over. I'm not sure whether to repot it or trim it. What kind of potting soil should I use? I've searched the internet and couldn't find any good information excpt on how to care for it. Any suggestions?