Had some chick the other day asking me about compatibility between bala sharks, pictus cats, red tail sharks, oscars, etc. After we finish chatting, she says okay I will be right back to get the fish...and when she comes back, she has a 5g tank in her hands. No hood, no filter, nothing else. I kind of eye her and sputter, is that for the fish we were just talking about? She says yes! Ask if she even has a filter or anything, nope. I go through my little speech of it being too small, you must have a filter, heater, go through the cycling process. She starts arguing with me and then cussing me out about she's always kept fish and they were fine...so I say "Aaaand why don't you still have those fish?". Boy if looks could kill... nonetheless I did tell her that I wouldn't do a guarantee on any fish she bought, and she stormed out in a huff. Idiots.