Pointing pumps at each other tends to not be very effective, the best would be that they are about 8" from the top, angled very slightly up, back corner to the front pane 3ft away, about a ft shy of diagonal corner to corner, this creates a rolling current rather than a hit and bounce back which is also basically a waste of flow. We want to avoid hard impacts and instead create a rolling current. You will then generally idle one pump at 30% while pulsing the other from 30-100% every few seconds and alternate them every 6 hours, the alternation mimics tides, the pulsing mimics waves.