I have a raph, and as cacichlids said, you will never see it. I have had mine for months, and the second he touched the water, he hid, and I've not seen him one time since. And this tank even has moonlights installed! In fact, I am only assuming he is alive as I type this. I suspect he's somewhere underneath a large piece of driftwood, but I'm not about to go moving stuff around to try to find him. If he's happy, then so be it.
But be prepared... unless you lack hiding spaces, you may not ever see this fish again. Good luck!
-Rich