Total newbie, so forgive my ignorance and impatience: Got my first fish tank for Christmas, went through all the prep, testing, etc., waited a week before adding fish. I fell in love with the Pictus Catfish at the petstore because they were so active, I planned my habitat around them. I got 2 one week ago. They won't leave the left wall of the tank. Up and down the left wall all day, they rarely swim around the bottom, never swim across the center of the tank, pretty much stay within 1" up & down the left wall; they don't act at all like the ones at the store (the store where I bought them or where I've seen them elsewhere). I tried shining a flashlight in the left side of the tank, which they clearing didn't like, but they have apparently decided to live with the light on the left wall of the aquarium rather than move to another part of the aquarium. I'm rather disappointed because I can't really see them, and I certainly am not enjoying them the way I did watching them at the store. Any ideas from experienced fishkeepers?