go to the secondary color tool, use select effect range pen to select blue halo only on your clip, use the mask next to see what got selected and what didnt, use the three sliders to adjust settings of the mask, saturation, hue, and luminance, once mask is at its best, just the blue halo,insert 2nd fx chroma blur, insert it before the color wheel,select medium on chroma blur, blur positioned 1st, wheel 2nd, now use your wheel to change the color of the mask, desaturate it, change the hue, this will help, why you got this blue halo is the real problem though, I personaly dont think any program will ever get rid of that, only tame it, GOOD LUCK