Did you try adding one or some of the effects under "Effect > Noise & Grain"?
To animate the glow's color, you could check out either the Hue/Saturation or Colorama effects.
thanks for the reply,
I did add a turbulence noise filter under my glow but what it did was wash out the glow colour. The default white colour of the noise filter mixes with the red colour of my glow so I get this washed pink look.
There has to be a way to just add the noise without chaging the colour of the glow.?
You could put Turbulent Noise on its own layer, animate it. precomp it (moving all attributes) and use it as a track matte.