Hi, I have a very deep header-tank which I sunk into the garden, bricks and broken slabs in and plants. With in a couple of years I had frogs and a newt well I think there's only one. It is now very well a part of the garden after 15 years with an abundance of frogs, a couple of years ago I was given a pond with all the bits which I placed near the header-tank. So now I have moving water and a still water which gives the frogs a bit of a variation.