SHARK TANK -"Episode 204" -- Tempers flare when guest Shark Mark Cuban urges the entrepreneurs to stop negotiating with the other Sharks if they even want a chance to make a business deal with him. In this episode, a fireman from Arkansas brings an invention to the Shark Tank that could make millions and save lives; after creating an eco-friendly way to listen to music on the go, a duo from Chicago hope the Sharks will want to invest; a feisty, combative entrepreneur from Montclair, New Jersey seeks to cash in on the lucrative wedding business; and a man from Oklahoma hopes the Sharks will smell the money when he pitches his unique male-oriented brand of candles, on "Shark Tank," FRIDAY, MAY 6 (8:00-9:00 p.m., ET) on the ABC Television Network. (ABC/CRAIG SJODIN) MARK CUBAN, DAYMOND JOHN