When you add something new to a tank, is it better to turn your lights off for the process, or keep them on? I didnt know if having them off would cause less stress on the object. In addition, I see that many members rubberband items in there tank, i.e. mushrooms, corals, etc. Does this cause a problem with releasing toxins from the rubber into the tank? Are there any other similar methods you use to accomplish the same thing?