Fish
Different species required for each of 3 depth-zones. The fish need to be herbivores.
- Surface
- Middle
- Bottom
Read more about this topic: Organisms Used In Water Purification
Famous quotes containing the word fish:
“If a fish is the movement of water embodied, given shape, then cat is a diagram and pattern of subtle air.”
—Doris Lessing (b. 1919)
“Do not tell fish stories where the people know you; but particularly, don’t tell them where they know the fish.”
—Mark Twain [Samuel Langhorne Clemens] (1835–1910)
“Here’s a fish hangs in the net like a poor man’s right in the law; ‘twill hardly come out.”
—William Shakespeare (1564–1616)