I was wondering when your fish are most active? I have a royal clown knife fish and most of the time he stays tucked away under a driftwood stump. He comes out later at night (11pmish) to feed and swim around and then around 2 am he goes back under his stump. Lately he's been getting active between 9am and 11am. Is this a normal change as he grows? Do these fish become more diurnal with age?