I just got a rubber-nosed pleco for my tank because all of my ottos kept dying. I got him/her because the guy at the lfs told me that they were really good at keeping the tank clean, and they don't get too big. I have a 10 gal tank. Well, my pleco keeps hiding, and I never see him come out or stick to the aquarium walls. He just keeps hiding inside a decoration so you can't see him. I don't know much about these. Is that normal? Will he come out after a few days?