All Same Class Enemies AI does the same thing

Let me explain,
So I have a side scroll plane shooter. I have tanks on the ground, all have turrets, which i copy and pasted. they are spread out along the level. One thing, they all rotate, and follow my plane but they all do it according to the very first tank made. so they all shoot the exact same angle, with the same number of bullets each time. They are mirror reflections of each other. Please some one tell me a quick step on how I give each its own "intelligent behavior", the all need the same qualities, just to be able to think separately from one another.



Thanks
Ren