That looks like it's from 1978
And yes, advertising is seldom ethical. Advertising laws state that a manufacturer cannot alter the product being sold, but not how its presented. That picture on a cereal box doesn't have milk on it. Its probably a paint glue mix. That model selling makeup is photoshopped to the Nth degree, etc. I learned at a young age not to believe in advertisements without fact checking them first. It's unfortunate that someone would look at the Aquatank box and think they can have such big fish in such a small tank, just because the box shows it. I feel sorry for fish that has happened to. However, I feel just as sorry for folks who believe everything that advertisements try to sell them. They're advertisements! They are biased things that try to make people spend money on an emotional, sometimes even subconscious level.
Don't get me wrong, shame on the Aquatank's manufacturer for allowing that image to hit the shelf. But also, shame on me if I drink their Kool-Aid and believe all they're selling me at face value
92% of all statistics are made up on the spot.