Well, the aquarium looked a little sad when I looked at it.  All I could find was one rotifer, some dried up shells of once living things, and some nematodes.  I guess trying some of the haunted water wasn't so good after all.  Here's a couple pictures of the rotifer and the nematode:

Ref.  Free Living Freshwater Protozoa.  D.J. Patterson, 1996.  Fig.18

Ref:  Smith, Douglas Grant.  Pennak's Freshwater Invertebrates of the United States.  2001.  Fig 7.3.

Smith, Douglas Grant.  Pennak's Freshwater Invertebrates of the United States.  2001.  Fig 7.3.