What could a gold fish have its attention on? And if it does have its attention on something and he lives in a bowl what could possibly distract it? A predator? In your house? Perhaps a cat, maybe Tom.
As for reading books, I think 50 is a quite easily attainable number, I like to read, otherwise I wouldn't be here reading articles on Steemit, I'd only watch the videos, and even though nowadays the internet takes a lot of my time, still I read more than 1 book every week.