Interesting about the food, I agree.  I need to start doing this.  I'm more a fillet type or market shrimp they are just so easy.  I get lots of frozen Tilapia fillets and cut them into bite sized cubes lol.  What do you do about your Mbu’s teeth?  Are they over grown? I can’t imagine the Crawfish’s outer shell is wearing down the Mbu’s teeth?