I'm sure if someone stumbles upon your plant with a milkjug on top of it they're going to be more suspicious of it than if it just looked like a plant growing normally.
Thats the point, its instant classic. If i stumbled upon a cannabis plant with a milk jug id laugh my ass off and take into consideration just how zonked out the grower must be! I think you should keep it on but thats just my 2cents.:thumbsup: