This area gets a whole page about it because it's such a common problem and there are QUITE A FEW solutions. The pundits will assert that there is only one way to control algae, and, you won't be surprised to discover it's the only way THEY know.

Algae Control can be discussed thusly

What is Algae?

Why Does it Matter?

How do you control "Green Water"?

How do you control "String Algae?

What's a Plecostomus?

What's a Veggie Filter?

Don't Koi Eat Plants?

Is Green Water Bad for Koi?

How About Chemical Control?

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Koi Beginner Once you've leapfrogged through this tutorial you will have a solid, working concept of the Koi hobby and what it's all about. This is done just about exclusively with video and very little written material.	DrJohnson.com More than koi health, this site spans all things animal, by a real veterinarian who shoots you straight.	Fishdoc.co.uk By Frank Prince-Iles. A UK authority who put this site together some time ago and which is still relied upon as a major source of good Koi and pond fish information
	PondCrisis.com If you have a koi, pond or fish problem, this site takes you through twenty easy questions and at the end you know what you need to fix in your pond to create restored Koi health.