Oh I get it!
Me:what are we looking at getting today?
customer: a goldfish for my kid
me: great, what is your set up? (Notice I didn't say tank size)
customer: we have a (insert bowl, 5.5, 10 gal).
me: oh Im sorry, goldfish have specific requirements. Your tank is just to small to handle all the waste they produce and they need colder water and more oxygen than other fish. But with the size you have a betta is your best bet because of XYZ.
customer: but we want a goldfish and we had them before Ina bowl and they lived for two years!
me: goldfish can live up to 30 years and can get the size of koi. So two years is 1/15th their life span. It couldn't grow and got sick. We dont sell goldfish in bowls for this reason. Can I interest you in a betta?
i hate goldfish people more than anything! Hate! I'm not afraid to say no lol!