I received my doctor (bluetooth) this week and set everything up but am not sure if it is working. I have a normal doctor that I can see it working at different times because the reactor will start producing bubbles in the tank. I have been watching this bluetooth one that I received and the only time I can get it to do anything is if I unplug it and plug it back in. I understand that it states it will go off at random times, but I watched my tank for almost an hour and it did nothing. My regular doctor is set for 500-700l and it goes off multiple times in an hour period.