on my four bay filter, the water comes into the first bay via a spray bar, falls through the first bay and rises up the second bay, and then falls down the 3rd bay. but on mine the partition between the 2nd and 3rd bay is siliconed on the sides, but not the bottom, so some water can actually seep under the bottom of the partition and not have to rise over the partition. is this normal, or should the bottom be siliconed too, making all the water rise over? I was thinking the silicone may have eroded around the bottom. So should I silicone the bottom up and make it water tight? anyone know the answer? cheers! thanks for the advice all.