How to remove space between bkground hdri and environment

How do I remove the space between my hdri background image thars on the skysphere and the environment, I’ve tried moving the skysphere down it does nothing?

I’m also trying to remove the paralax in the background image so it it doesn’t get bigger or smaller regardless of how close to the white wall you are or not?

I thought i had this cracked but clearly not, would appreciate some help.