My baby boy, Benny the betta, he is too cute. :P Of course, you'd all say that about your fishys too, right?
But, I always have my fingernails painted. I repaint them a different color about every three days. And last night, while feeding Benny, I had my hand on the side of his tank, but my fingers were curled under so he could see my nails. I look down, and he is massive! Flaring at my fingernails!
At first, I was wondering what he was doing, so I moved my hand, and he calmed down and swam away. And I was like, "weirdo fish, what are you lookin' at?" So, needless to say, I put my pointer finger to the tank, and when he caught sight of my fingernail, he swam up to it, and flared again! So I was playing with him a bit, under he finally rammed into the tank itself, and then I felt bad, so I stopped. But, seriously, it was really cute and extremely funny!
My nails were a shiny teal color, very pretty.
But, seriously, if you can't get your fish to flare, paint a nail and show it to them, it might work :P