There is things you can do to help entice them out more like subdued lighting, schools of small "dither" fish to help them feel safer, no large aggressive tankmates and having the tank in a quiet traffic free place.
Some one posted a great idea a while ago (Donna I think) where they had a piece of glass that was on little legs about half an inch from the substrate and her khulis gathered under it and she could still see them all. They did not seem worried that the glass was clear. I will see if I can find it and post a link.
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