I see nothing wrong with it. I do'nt know what a magestic rabbit is so i'm not going to work that in to the proportion.
If you get the two clownfish together at the same time... make sure you buy that around 3 inches or so. Then wait a LONG time and get the algae to bloom. Onc eyou do so... get a lawnomwer blenny. HTere's one that was at my LFS that was four inches long (it looked bigger). THen after a while add the lionfish.
Now, not to intrude on ur threat but what is a magestic rabbit?