Back in the day when I first set up a tank I lived in a rather rough part of town but worked nearby so all was good. There was always police cars and foot patrols in the area so I didn't give it much thought until one day a couple nice officers walked by and commented about the bright lights in the living room that were visible even through blackout curtains. I invited them in and showed them the ~400g worth of tanks. I never got questioned again about them.