When all five Sharks invested $1 million in season five in the mobile phone breathalyzer, Breathometer, Charles Michael Yim, from Burlingame, California made, "Shark Tank" history. But now, the Sharks question why the current $50 million value of Breathometer is only good on paper, and a dissatisfied Kevin O'Leary checks in with Michael for answers.In season six, Daymond John made a deal with New York City's Randy Goldberg and David Heath and Bombas, a sock business with a social mission. Although the business is doing great online, the duo question if their limited managerial skills and competition from market giants will hinder their growth potential.Since Mark Peterson's season six appearance, his sales increased three-fold in the gold panning kit, Gold Rush Nugget Bucket. But Robert Herjavec thinks Mark is possibly missing an opportunity for further growth since he's failed to create a solid social media presence.Barbara Corcoran invested in season six in the seasonal decoration kits, Hoppy Paws, created by Trina Barkouras from Costa Mesa, California. Trina has been spending her time creating new products, but Barbara has solid reasons as to why that business strategy is not a good one.