I added a Plecostomus earlier today and it's still hiding under my driftwood. It's just hanging upside down on the wood. Is this normal adjustment or could it be scared of my other fish? I added it as my fish were eating on the other end of the tank. None of the fish noticed me adding it. My electric yellow lab discovered it, but didn't seem to care. Hopefully I wake up tomorrow and the little guy is hard at work cleaning my tank.