I found if you make a few caves facing the front glass or at a slight angle with a bit of luck they will use one and it makes feeding a bit easier too, having said that my current tank is set up more naturally with a few smooth rocks and lots of wood/root and hardly ever see my striped Raphael same goes for my jag cat
I have both striped and spotted Raphael in my 135 gallon. My striped I see only occasionally at feeding time. I have not seen my spotted come out in at least 6 months. They both live in a fake tree stump. It's a real treat when he does come out lol.