Like everyone has said, fry can be tough. When I pick, I look for color, pearls and flowerline. I personally like faders, so I try to pick those out of the tanks. I've only got one now, but he was fading at 1.25" at the LFS. I plan on picking up another one or two this weekend. One will be a 2" fading yellow. There's nothing else fading in my LFS so I'll be looking at all the fry and probably picking the one with the reddest fins.