The milk crate
comes about 1" below the surface of the water and once the lilies actually
start to GROW for a change, you can't see the black milk crates at all! ...

When the koi get bigger than the milk crates they will move them around at
will....it is like a ball game in my pond they move whatever they like at will
Jerri

http://www.fringeweb.com/Ponds/JerrisPond