Yeah, those guys don't exactly ham it up. At least IME, they are incredibly shy when they are young. I have one who, for two months, I totally forgot I even had. He just NEVER came out if there was any light. Then one day I moved a pipe and was like, "What the....?!?!?!?!" Took me a moment, and then it was like OH YEAH! LOL Now that he's hitting the 8-9" mark, he's been starting to shoot out of his pipe to eat even if the lights on. He doesn't hang out for long, but its been a nice change to at least know if he's still alive without dismantling the tank. How big is your little guy, and how long have you had him?
It's about 7" and I got him back in February at 2" Mine comes out now and then during feeding time to remind me he's there and of course not to forget to put enough food for it as well, LOL. It's a pig!