Some of my lizards will constantly shove themselves up against the glass when I walk by. Most of my fish don't do it though since I don't have cichlids
The video is a bit dark as lights are off in the morning. What you're seeing there is clown loaches at the surface waiting to be fed. They open their mouths wide and poke their noses out of the the water waiting for the food like baby birds...The height is about 2.5 feet. If I taunted them a bit, they'd be splashing at my face..