Is there such a thing as too much oxygen in the water? Since my sump has gone south I capped off my over flows and added a FX5. and took the mag drive pump and place it into one of the over flows to help circulate the water. I added a couple of PVC pipes off the pump to create a spray bar accross the top. Since the water is moving at such a high rate it is creating a high volume of bubbles in the water. Can there be too much o2 in the water that it will harm the fish?