I have to agree with the others. Keep your opinions and advice to yourself or save it for those who are willing to listen with an open mind. It sounds as though he is playing games with you when he asks if he can keep a FW Stingray in a bowl. He can't be serious. Almost as if he gets a rise out of seeing you get all hyped up. Don't feed his ego any longer and let him and his mom (who no doubt is paying for his hobby) flush thier hard earned money down the toilet.
