Get a dedicated turkey baster (all plastic) for your tank. Great for cleaning off rocks when doing water changes too. Anyway, create a area under a rock with it by blowing out some sand underneath the edge of a rock at the front of your tank (so you can see him more, of course). Maybe 3-4" or so. I know you can't see under rock, but give it a try. I'm betting he'll hang out there once the dust settles.
What Joy said is true, as watchman's really don't dig IME.
"Life may not be the party we hoped for but while we are here we might as well dance!"