Assuming your row with the "x" inside it, is row 6, and assuming you started using this formula to look back 85 days is in column CX,
Then highlight cells CX5:DX100, then go to Conditional Formatting and choose: "New Rule"
Then choose: " Use a formula to determine which cells to format"
Then in the box put this formula:
=AND(CX6="x",CX5>0)
The choose: " Format " , and then choose a color, then click "ok", and "ok" again.
Then go back into Conditional Formatting, and choose: " Manage Rules "
And change the range to how far you really want it to go to...
Of course change all these references to what your actual cell references are...
I hope this helps...