Question Particle effect clashes with background graphics

I'm making a 2.5D side scrolling shooter and in one stage I have the Earth as part of the background. When enemy bullets pass over the Earth they become impossible to see as they clash with the clouds. I've already set the scene up so enemy bullets are rendered on top of everything else so this isn't the issue here, basically it's happening because the clouds are bright white so the particles end up blending in with them.

What can I do to solve this? I cant seem to edit the cloud shader to make them appear less bright (they use mobile/additive shader) so i'm a little stuck at the moment.