This should work to hide and unhide the color code 123 highlighted row and the row below.
Sub HideRows()
Dim Cell As Range,
cRange As Range,
LtRow As Long
LtRow = ActiveSheet.Cells(Rows.Count, "C").End(xlUp).Row
Set cRange = Range("C1:C" & LtRow)
For Each Cell In cRange
If Cell.Interior.ColorIndex = 123 Then
Cell.EntireRow.Hidden = True
Cell.Offset(0,1).EntireRow.Hidden = True
End If
Next Cell
End Sub
Sub unHideRows()
Dim Cell As Range,
cRange As Range,
LtRow As Long
LtRow = ActiveSheet.Cells(Rows.Count, "C").End(xlUp).Row
Set cRange = Range("C1:C" & LtRow)
For Each Cell In cRange
If Cell.Interior.ColorIndex = 123 Then
Cell.EntireRow.Hidden = False
Cell.Offset(0,1).EntireRow.Hidden = False
End If
Next Cell
End Sub