flying units

is there a field that can be changed that would stop groups of flying units currently touching eachother to slowly spread out? My use for this is a bit strange. I have an ability that creates many invincible flying units that don't attack, however they block out the sky making it harder to target units individually. At first i tried selection scale increases, but regardless of its size the unit below always can be selected. Anyone know how to achieve what i want?

There is a thing under object editor under the ait unit that is called collison, if you set it to 0 it should prevent the units from spreading out, but you may need a trigger to move them out because tehy will stack on top of each other, or you could set it to a small number like 1 or 2 but they still would drift apart. to fix the selection thing just change the selection size of the unit under object editor.

good luck on your map!