Just some manatees for your wall,  mounting them may require double sided tape unless someone convinces me to add some screw hooks.

All should print without supports, wireframe is by far the most challenging without supports.  A couple organic tree supports would buy you more than you need.

Update:

  - Updated wireframe to be a little more easily printable on FDM (thickened a couple arms etc) (see wireframe-v2)

Collect the full Aquarium: 

The manatee, seahorse, hammerhead, sea-turtle and the star-fish.