Mr. Evil is terrorizing my CA 150 tank. He's quite lucky he won't fit down the toliet right now... (Just kidding, kinda...) I'm only assuming it's a Mr. and not Mrs. Evil, not really sure. I picked him up last summer when he was only about an inch long; now he's about 7 or 8" and his hump is starting to develop. At the time I didn't know very much about CAs and created quite a disasterous mix. 
First $10.00 takes him home. Better hurry before I decide to go spear fishing in my livingroom...
Pick up in Grand Blanc, MI