It’s beginning to look a lot like Christmas in the tank on “Shark Tank” during “25 Days of Christmas,” SUNDAY, DEC. 3 (9:00-10:00 p.m. EST), on The ABC Television Network, streaming and on demand. In this episode, a pair of entrepreneurs hope they have the fix for keeping you completely warm during the holiday season; one entrepreneur has taken the Christmas tree to a whole new level; one entrepreneur is hoping the sharks will like his take on covering a Christmas nuisance; and an entrepreneur duo may have just found your kid’s direct connection to jolly old Saint Nick.