Thanks for that response, i will try that, the thing is that i actually dont get any problems with the game if it try destroy actor that not exists, what i was thinking about was that as long as the player stay on same level fighting this cubes it will fill up that array allot with not existing cubes (wich i dont want to destroy from array until i unload that level) , but i guess that will not cause any bigger problems or fill the memory to much :).