You can see in the previous picture where I tamped down the soil by jumping on it. Your soil may vary, but be aware that any soil you add back while leveling the pond will settle, especially when all of the water weight sits on it. I always run a fill test on any tank or pond I build and let the water sit for a week. If it's still level after a week, I back fill the dirt in the gaps around the edges (with the tank still full) and water it in good to help it settle.
