Good Day

I have the below formula in my excel file, i would like to add conditional formatting as follows; between 0% & 29.99% (Red); Equals to 30% (Yellow); Greater than 30% (Green).

The problem i am experiencing is that the blank cells also change green with the conditional formatting, and i do not want to remove the formula.

=IF(ISERROR(F3/E3),"",(F3/E3))

Please Help.

Thanks.