I see what you mean. The critter keeper is clear plastic, about 6" long and 3" wide. I don't see why it wouldn't be interested in burrowing in it. The sand is pretty fine, there aren't any large pebbles or anything....I'm concerned if I don't immediately put it in my main tank, it won't take to frozen foods and it'll end up starving to death. But, if I put it in my display tank, I'm afraid of the ich. What if it goes in the display tank and a few days later everyones convered in ich? I've hypo-ed my entire display tank before in the past, but I'm almost certain it'll kill the small pods this guy needs, and he may starve even in display! What would really be great would be if he took to frozen foods right off the bat...That would be perfect....