Emily Castro and Melissa Harrington have laid out a few big challenges for their seafood business, FishFixe, and those issues have scared most of the Sharks off. Kevin O'Leary has made an offer but they seem hesitant to give up the equity. Can they find a way to make it work? From 'SharkTank' season 13, episode 6. Watch 'SharkTank' FRIDAYS 8/7c on ABC. Stream on Hulu.