I guess my years in the business end of this hobby have led me to not grow as attached to most of the fish I see dying, and I just simply put them out of their misery as soon as possible. Cervical dislocation, or cutting their head of in one quick motion works great if you have a heavy very sharp knife, and a leathered heart. Personally I have never agreed with the freezing method, always thought it was too long and drawn out. The MS222 works great but its expensive and I like to save it for tranport/surgery. Also I have used the shooting method with a couple of very large naso tangs and angels(high powered air handgun). And if the fish are smaller and I have predetors on hand, they dissapear real quick.