Using Nikon D90 and SB600 Flash?

Use bounce flash indoors, evening shots with lights on. The subjects faces are coming out too red. What to try?

You seem to be having a problem using both incandescent and flash. The white balance on your camera is probably set to flash or worse "auto".

In order to get good white balance, you will have to add a 85b gel on your flash and then set the white balance to incandescent.

This is what you would have to do, no matter what camera or flash you are using

It seems that you do not understand white balance and what you have to do to assure that you are not using two light sources that are producing different colour light

Aces way is a bit cumbersome but it will work. Start by thinking wb. If flash is the main source of light then set for that.