Hi guys. I'm building my first vivarium and I have about a half inch of free standing water under the false bottom. There is one pump in the middle of the tank that runs water up the walls and waterfalls back down so there is some water movement in the false bottom. My concern is weather or not that is enough water flow for the semi stagnant water in the false bottom? The tank is a 55 g so I imagine the water at either end of the tank will not move fast. So my question is basically should I just leave it and consider that to be standard and acceptable and do weekly water changes? Or should I place a small circulation pump AMD possible filter under there to keep everything moving better? Or should I place foam wedge on either side as to limit the total water volume and keep it more centered in the tank for maximum disturbance? Thanks.