Most expensive live aquaria divers den freshwater fish $1900

[Deadeye]

Not the most expensive fish on there, but this is pretty screwed up:

Aquarists can get premium WYSIWYG aquatic life at LiveAquaria®’s Diver’s Den®

www.liveaquaria.com

Not to mention they say the fish gets 9 inches and can live in a 55 for life.