It's Sink or Swim in the Challenge Arena to decide who's on the chopping block, just as Ash and Tobias admit their feelings for each other.

Milly and Bailey are in love, Max and Bianca in lust and Tash and Sean somewhere in between. So can 'cash couple' Aleisha and Antoni stay in the game and make it through to Heartbreak Island's top 3.

Can Bailey and Milly battle on? Can Sean and Tash stand staunch? And is Antoni and Aleisha's dash for cash on track? It's business time as three couples become two in the race for $100,000.