On 21 Jul 2006 15:46:21 -0700, wrote:

I saw a recent message on green water. I have a 1200 gallon koi pond,
and this year the water has been really dark green. I can hardly see
the fish. Will this cause the fish to develop ulcers or sickness? I
changed the filter and replaced about 2/3 of the water, but it is still
very dark. If the pond needs shade, is the answer just plants or
maybe an awning??? Thanks for any help. Dan

Both very likely.

How many gallons? How many fish, kinds & sizes? Do you have test kits? What
are your water parameters? ~ jan
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See my ponds and filter design:
www.jjspond.us
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Also ponding troll free at:
http://groups.google.com/group/The-Freshwater-Aquarium