Just let him fall. He'll lose money and either A) get discouraged and quite fishkeeping, or B) try to find out why they all died overnight. Sadly, C) is "Just get new fish" and do nothing new. At that point you stop going over his house...
Have you actually seen any of these tanks?
I dont think I have ever even seen a 1 gal tank.
Maybe he is just pulling your leg, or has the sizes wrong, for some reason people have a weird sense of what size their tanks actually is.
He thinks because they arnt dying that it means they are happy
:rofl:Show him a picture of a homeless man living in a cardboard box. Then ask him if he thinks that just because the man is alive he is happy.
EDIT: Alternative method. Keep him in a small box for a week and then ask him if he's happy.
This thread makes me very sad. I hate the poor treatment of animals no matter how small or smart they are.
they're commonly very gaudy and have lousy filtration as well.They do sell 1 gallon corner tanks...small size aside they have horrendous dimensions too.