The optimum water level in the pond is based on the uppermost, undulating shallow water zone. This should always be filled with water. Only then will the pond provide suitable spawning grounds for Green toads. In addition, the correct water level guarantees that amphibians and other small animals can get out of the pond safely. If the water level in your pond has dropped below the shallow water zone, please fill the pond to the optimum level immediately and confirm this in the AmphiApp.