What does everyone think? I know that when I fish they respond to different baits AND tactics at different times, but often once (or if) I discover what the magic combo is, I can't really tell how it's related to a particular hatch that's going on. For example, I may see march browns coming off with fish rising, but it's a small, light-colored emerger they finally start biting on. Some days they hit zebra midges, some they don't. I do know that I tie light colored nymphs that I call "Hare's Ear" just because of the shading, and dark ones I call "Pheasant Tail" for the same reason, but I use whatever material I pull out of my box that looks about right. I mainly try to have some light ones and some dark ones in different sizes.
I've had good luck with Pat's Rubber legs tied with a floppy leg material that's popular now. So, I said, let me tie some up with a tapered abdomen that will look more like a stonefly nymph. Nope. Don't work as well. It's all so much still a mystery to me.