How to use conditional formatting to compare two columns

Question

Here is a very simple conditional formatting problem although I cannot see what I am doing wrong.

I want the cells in column E to be green if they have a greater value within than the cells in column C and red if vice versa. What am I missing

Answer 1

It is only looking specifically at cells C1000 and E1000, try $C2>$E2 and $E2>=$C2 to make the formula portable