I have went through my pictus and they are hit and miss. My spotted pictus as babies were out all the time, with age they were barely out. My fourlines as they were sold but actually are white and a spotted pim have always been hiders and I would see them come out and my mouth would drop open at their growth, because I wouldnt see them much LOL The light comes on and they freak out, gravel flies and you just see a streak from them swimming for cover.
Feeding time with the light on they often sneak out for some. You see these huge whiskers come out of the log and a streak to the food and back to the log.
My bullhead.... I am still not sure. As a baby when I got him, he was so tiny you could barely see him, he hid all the time. Now that he is 3" he is out a lot in the light cruising around. He never stops moving and hides in leaves in the tank. As he gets bigger though I am not sure if he will just hide more like the rest
I just gave up and did the moonlight thing so I can see my fish. Lights on people think I have a tetra tank LOL and can not believe what is hiding on the bottom. My common pleco comes out more then anything. My vampire pleco is very skidish and I barely see him.