Went to buy a replacement goldfish (DD's lasted 6 months) and I was refused by the most miserable assistant because I didn't have a filter in the tank. Bought an overpriced filter.
Went back today and they refused because it hadn't been switched on for a minimum of 3 days. Then they asked what size tank I had, I said a starter kit. They said for ONE goldfish I need to have a tank around the 60L mark as they can grow upto 30cm and that the (goldfish!!) starter kits weren't big enough. 
AIBU to want to buy my daughter a goldfish without needing a degree in marine biology and a huge aquarium?! Fair enough for tropical fish but a humble goldfish? And does anyone know where I can buy one without a background check? 