Baldur is a feisty fella and flares at whatever he can! The thing I like the most about him though is how he'll swim up towards the front of the tank whenever I enter the room and walk past him, following my shadow around I guess.
My CT blue and red male, lovingly names Sir Owen of Hemmingway, he flares his gills at my face sometimes. Whenever I walk to his tank he swims over and flares his gills, he also flared his gills at my camera lens. I have a funny time lapse photo set of him swimming over cautiously and up to the camera with his gill flared.