Hi again Han,
Thanks for your nice comments about my pond.
In my opinion, aeration is important for both water quality and the health of your fish. Even though you will be topping up regularly, it won't take long for the water to become stagnant in summer.
You could set up a simple pump or do something more decorative like a bamboo water spout. Here is a picture of a small water feature I have in the front yard.
2011 August water feature.jpg
If you don't have power available, there are even solar powered pumps available.
Here is a picture of the top pond that I collect my water from. The aquatic plants help filter and aerate the water.
2011 August top pond.jpg
Apologies for the picture quality, I just snapped them on my phone in between rain showers.
Regards,
Steven
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