Loaches are very social, so maybe if you added 3-4 more to the tank they would come out more often. Kuhlis are generally nocturnal though and I've heard they hide almost all the time....but add more and see how that goes.
Your Iridescent shark is going to get huge and shouldn't be kept in a 29g tank (actually they get way too large for any aquarium IMO), so perhaps you can trade that for 6 or so Kuhlis and maybe with a large group they will come out more often.
Are you feeding him anything? Kuhlis need some kind of food....a bottom feeder wafer or pellet would be a good food for him.
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