How to get Firefly to put object beside another object (instead of inside it)

I want to create an image of a large empty terrarium tank and a stack of old books, all on top of a wooden bookcase in an old library.

The prompt I'm using is:

"large rectangular wood-framed glass tank with wooden base beside stack of old books, on long wide wooden bookcase in old-fashioned library"

Firefly keeps on generating images where the books are inside the tank, not alongside it.

I've tried saying "alongside" instead of "beside" but it makes no difference.

Is there a way to force Firefly to put the books where I want them?

I've considered dropping the books completely from the prompt and adding them later with Photoshop's generative fill feature, but I can't make the bookcase wide enough that there's space to add the books.

Note that I'm a novice with Firefly and with generative AI prompting in general, so please don't throw a lot of specialist terminology at me!

Regards,

Bruce

P.S. Firefly is also ignoring the prompt to give the tank a wooden frame, but that's less important to me.