Those look like shovelnose sharks and stingrays at the bottom. I sure hope your friends a dealer or something. That thing is extremly overcrowded.
Any pics of the whole tub?
I have a lfs in Orlando I would like to talk to your contact about buying some of the sharks, Blk tips run around $200.00 @ wholesale and around $400-500 Retail Please e-mail me with his information @aquaticdesignsfl.com