Inspiration For Large Tank...

Lookin for some ideas from the creative collective we have here.... So the plans are to build a steel framed tank with poly-vinyl interior and a single glass or acrylic front window. Rough dimensions are 120"Lx32"Dx36"H, considering 48"H... Filtration will be well taken care of. Trying to figure out what to put in it??? Ideas so far...

Vampire Tetra School http://www.thejump.net/id/payara.htm
Assorted Stingrays

Assorted Arrowanas(not silver or black)
Assorted Stingrays

Any other ideas would be appreciated, no bread and butter fish.... something interesting!
Cheers!