What is the setting of book Fish Two Red Blue by Dr. Seuss?

There's no book by Dr. Seuss called "Fish Two Red Blue". It's possible you're misremembering the title, or perhaps it's a book by a different author.

Do you recall any other details about the book, such as:

* The plot or characters: Were there fish involved? Red and blue objects?

* Illustrations: What did the cover look like?

* Time period: Did you read it as a child or more recently?

With more information, I might be able to help you identify the book!