My friend was contemplating getting one. His wife was onboard. Once they figured that they had right at 1000 majano and these units most of them have a cycle time of a minute on and 2 minutes off. He figured he has maybe 2 hours a night he can mess with the tank after work. If he did nothing but zap majanos at 3 minutes per biological unit it would take 25 nights if all the ones died that he crisped and none of the others reproduced. On the bright side he said he would lose a lot of weight cuz he didn't figure in time to eat supper.