Howl likes to flare and chase his shrimp around the tank, or he'll see one just sitting there doing shrimpy things. He'll swim behind a nearby plant or decoration, get down to its level and watch it for a minute before lunging out from his hiding place. He never tries to eat the shrimp, just scare them to death.
Whenever I give Howl a piece of raw meat he'll circle it a few times flaring then lunges at it and shreds it to little pieces. All I see is a cloud of meat going everywhere. He then swims around happily vacuuming up all the little bits.
Recently I got a Kinder Surprise for christmas, the toy was this little figurine of a girl with green hair, whenever Howl sees it he flares and gets all upset. He never flares at anything but reflections of himself, his shrimp and food.
Domino is like a creepy stalker from a horror movie. I'll sit next to his tank, when I look in I can't see him so I'll look all over. I finally find him in his plant. He's just sitting there with one eye visible watching me. When I find him he comes out and dances around the front saying "Food Time!". If I don't feed him he goes back into the plant and does his stalker routine again.
When I have my laptop out or put anything next to his tank he'll sit there mesmerized by whatever it is for a good hour except for the occasional breath.