I soaked him today after I noticed his blue eyes. He was soaking for about 30 minutes. I try to do this once a week or so anyway. I also spray his enclosure a couple times a week - not too much, just enough to lightly dampen the upper layers of the coconut fiber. I've also given him a nice humid-hide on the warm side; it's a round tupperware container with damp paper-towels. I'm not sure yet how quickly it dries out, so I'll be checking it every morning to get a good idea of how often I need to moisten it up again. I figure changing the paper-towels once a week should be fine.

Thanks for the input, Jo!