I have a wedding coming up in the same location that this picture was taken. It's an old opera house, and the stage lighting is set up for plays and theatrical productions. I had a HUGE problem as you can see with red cast, from the lights and the huge red curtain at my last wedding there (luckily, it wasn't paid and I wasn't the main photog!). What would you do to combat this problem? Would a custom WB help/fix the problem?