It is interesting to see different individuals take on wild life in cages and how humans as a whole do things. I don't mean it in a bad way in the least mind you. But how does one decide what animals should be domesticated and tamed and which ones should not? Where do you think any pet you have now came from?
All animals at one time or another were wild and people took them from their original place of origin, moved them somewhere else and proceeded to keep them as pets. I'm not just talking about dogs, cats, horses (which technically were never meant to be 'rode'), cows and pigs, but every exotic you see now. From the more simple ones of rats, hamsters and mice, to the more exotic of chinchillas, degus, sugar gliders, parrots/birds, snakes, lizards even up to whales, etc.
Especially in the case where some of these are taken from the big open wild and put in fish tanks (albeit some are large but still you can't compare it to what they once had). That goes for the same whether it pertains to a lizard or a whale. That is, in essence, what the domestication of an animal is. We take, breed, choose, breed and repeat until we have what we want in an animal (usually tame and good genetics is what breeders attempt to achieve) and then people work to continually ‘better’ the species through breeding.
IMO it is no different than what we have done for 1000s of years.