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I just saw my raphael catfish for the first time in awhile the other night. But I found out where his "den" is and I rearranged it a little so that now when he is sleeping in his little den I can see inside.
All they need is to get used to the light, be it moonlight or room light. Should you be considering moonlights, red LED is best ime. I "measured" by how spooked my fish were when going from darkness to blue and red LED and cold cathode moonlights.
*it's easiest to see them under blue cold cathode, btw. "Best" above is with fish in mind.