Painting in plants
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I came across this while looking for a new tank for my goldfish. This tank is truly a work of art and the article explains how the composition works. One thing that was driving me nuts were the waterfalls. Waterfalls underwater? I looked it up and they are built with hidden water pumps and fine grained, white sand. The pumps pick up the sand and it falls to the bottom, creating the illusion of falling water.
http://scapefu.com/analysis-of-sunrise-in-the-valley/