Hi everyone. My flowerhorn is 2 years old. We have him in our living room. So started to notice that at night time and when our lights are dimmed my flower horn hides behind his log. And If I go near the tank he go's nuts bumping on the walls as if he's really scared. And during the day. He is very happy swimming around. And even follows us around and played with our hands. Never gets scared or frightened. But when it gets dark it's a whole different story? Is this normal. Or is my fish having trouble seeing in the darkness.? ? any ideas?