I want to grow earthworms that will compost and that could be used for fishing (I don't fish often but I have lots of friends that do). I think it would be convenient to have worms digest my scraps. I know that red wigglers are bad candidates because you can't fish with them. I want to grow nightcrawlers. I know Canadian Nightcrawlers do not compost. My question is, what worm do I want to use? Couldn't I just go to my yard and find some?