Left over food with ACF means an overfeeding problem. ACF generally do not leave food behind as they are glutenous little pigs. Try cutting back about 25% of what you normally feed and see if this helps. Remember, these frogs don't need to pack on the fat to get them in between long feedings so you can feed them a little less. They will eat until they feel ready to burst, which sounds like they are if they are leaving food behind.