I have a 180 with a LMB about 16 inches a bluegill about 8 inches and a 10 inch common pleco. I caught the LMB and the Bluegill. I wish I hadn't kept the LMB. He is interesting but his presence limits what I can also put in the tank. My conscience won't allow me to release him and I really don't want to eat him after keeping him for a few months as I am attached to him. I want to have a more diverse population in my tank and I know inevitably he will outgrow the 180g tank. I think I will give him to my brother to clean and eat. My advice would be think long and hard about the needs of the critter for his entire life cycle before you throw him in your tank.
You could always put him in a blender, pour into ice cube trays, and feed to the much smaller fish that you replace him with.