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Moderator Ambassador Field Correspondent ![](images/stars.gif) Lunker
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Moderator Ambassador Field Correspondent ![](images/stars.gif) Lunker
Joined: Jan 2009
Posts: 28,705 Likes: 893 |
Plants can utilize sunlight at a low level, which is typically about 2x the reading on the secchi disk. I wouldn't use phytoplankton to achieve readings below 12" because at night they use rather than produce O2, and could be the cause of a fishkill during periods of low sunlight.
I'd prefer using dye to keep the secchi disk reading below 12", but I think the GC/Tilapia route is a better one to take and leave the opaciticy over 12".
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