Only person i heard of selling them went to jail for heroin distribution(i didnt know them directly but something sounded fishy about them), that said they wouldnt be an ecological hazzard in Canberra(northern Australia would be a differant kettle of fish) There are heaps of fish that are far more of an ecological problem available in pet shops, so hypothetically its not really that bad keeping them in an area where they couldnt survive. They are pretty awesome fish, you can make spears and stuff from them too. Dont do it though they are illegal.