It also depends on the inhabitants and general object placement. My raphael just hides now, but when I had him in a tank arranged specifically for catfish, he got into the habit of strolling from cave to cave, and was spending more and more time in plain sight during the day until I redid things. Now in a 55 with two pieces of leaning slate to hide behind, he never moves during the day. For most people, 'raphael catfish' and 'behavior' probably won't be found in the same sentence unless you sneak out at night and catch him on the prowl.