Fish n chips that's an interesting idea to place it on wet concrete but what i am trying to achieve is not only to have a natural look but also a natural place for my fishes. I still don't get any words about that from you
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I am an architect. What i know is, if the concrete gets wet and dried repeatedly, it will get cracks. But if it is always dry or always wet, it won't make any problems(There are lots of docks in the sea, supported by concrete columns. And between the concrete and soil layers, there should be a couple materials to make it water proof. I suppose concrete will work fine.
