Sub ApplySpecialFormattingAll()
For Each ws In ThisWorkbook.Worksheets
ws.UsedRange.FormatConditions.Delete
For Each cell In ws.UsedRange.Cells
If Not IsEmpty(cell) Then
cell.FormatConditions.Add Type:=xlExpression, _
Formula1:="=or(ISERR(RC),isna(RC))"
cell.FormatConditions(1).Font.Color = cell.Interior.Color
cell.FormatConditions.Add Type:=xlCellValue, Operator:=xlLess, _
Formula1:="0"
cell.FormatConditions(2).Font.ColorIndex = 3
End If
Next cell
Next ws
End Sub