The boys are in bed and we are setting up the new tank. It is a 28g bowfront Topfin. It came with a filter, heater top and light. We put the gravel and about 5/6 of the water in so that there will be room to add plants and decorations later before we top it off. When we plugged in the filter it made a horrible sound. Then I reread the instructions which said to add water into the filter on the intake side until it overflowed to the cartridge side. We started to do that and noticed water flowing out the bottom back of the filter down the back of the tank! Is my filter broken? Right now it is unplugged for safety.