I found that my veiled had difficulty when the cup was a clear plastic, and got very confused. Now we use a green pudding bowl (which the locusts jump straight out of but the crickets stay in). We started off putting loads of crickets in there, so it was easy to see all the movement and catch his attention. He quite likes it as he knows where his food is and just wanders over when he fancies a snack. It stays in until about an hour before his lights go out.