I agree with Matt - the problem with the LionFish, is that it "messes" really badly.... And it might just grow too big - even though it is a "dwarf"...
Rather go for fish like a Midasblenny, perhaps Fire or Flame Gobies....
Perhaps some small dwarf angel (lemonpeel angel perhaps, or bi-color?)...
Perhaps Royal Dottyback (strawberry or the "normal" Royal dottyback), perhaps even a Royal Gramma....
Coralwise - I would say a few colorful corrallimorph mushrooms, zoanthids, perhaps a brain coral or two.... And some leathers are always "nice to have" (ie, pin-cushion, sarcophyton, singularia, etc)....
Kenya tree/Colt coral.....