What is your cage set up like? Do you have plenty of hiding spaces? The bigger Waxy may seem like a "predator" to the other two smaller ones and they are scared to move to eat. Or perhaps the bigger one has just adjusted faster to his new environment then the other two. I'm not really sure if Waxys are communal really...? and perhaps the smaller ones are just stressed...? Or...they are just not hungry. There could be many reasons why they are not eating.