He probably expects you to keep appropriate sized fish that aren’t as active as a danio. Danios are small but are extremely active, a 15 is on the small size for danios
And you’re mixing fish that have different temp requirements and goldfish get 10-12”, so your tank is way too small for just the goldfish. Maybe you should ask before you buy if you don’t know rather than get defensive over knowledgeable people giving you GOOD advice
And you’re mixing fish that have different temp requirements and goldfish get 10-12”, so your tank is way too small for just the goldfish. Maybe you should ask before you buy if you don’t know rather than get defensive over knowledgeable people giving you GOOD advice