I do think that is a valid point Darth, at least partly. I will admit I do not know the intelligence of the fish in question (Clown Knife or Aro, If you know please let me know) but I would have to assume that it also doesnt compare with a dog, as a dog can really be destroyed and miss a person if its given away, I think a fish is more stressed by change in environment. Yeah my Jack shows me that it recognizes me, and I do often compare him to a puppy, and I would be devastated if something happen to him, I'm pretty sure than as long as he is in a fitting environment and being fed he'd be happy. But if I raise a Clown Knife to 12-14" giving it a good home, and I am able to sell him to someone that needs a big fish for there already set up big tank, or give/sell it to my LFS which has large aquariums for large fish they sell and display, I don't think it is going to mentally scar the fish. That said, I am very attached to my Jack, and can't even fathom giving him away, so I doubt I will ever grow a fish with just the intent to sell, but its good to see the pro's and cons of any subject.