i have a african brown knife about 7 in in length and i've had him for a long time mostly he'd stay hid and wouldn't see him out till after lights out but here recently he's been out mostly during the day time resting on my plants and playing back and fourth at the glass is this normal??? He's in a 55 gallon planted tank with a common pleco, pictus cat, and tiger barbs. Never had him eat any of the tiger barbs i feed flakes, bloodworms, sinking shrimp pellets.