This is nice. If I may make a few suggestions:

 - Lower your anti-aliasing threshold; there are some noticeable aliasing
artifacts in the reflection and on the bottom of the sphere.
 - You can see the area light sampling bands on the floor. You can eliminate
this by bringing up the number of area light samples. Be sure to use
"adaptive 1" so that higher sampling is only done in the partially-shadowed
areas. If you're worried about this making the media render slowly, you
might consider using two separate area lights: one for the media and one for
the solid objects, by using light_groups.
 - The media itself has some banding problems. If you bring up the number of
media samples ("samples 20" for example), this could be reduced.
 - Finally, you might consider doing something to hide the abrupt ending of
the ceiling towards the edges of the scene. Maybe add walls, or make the
ceiling go farther out.

 - Slime
 [ http://www.slimeland.com/ ]

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