Stargazer
Surin Legend
Our mid-size (800,000 liter) lake with tilapia and koi has light green water, visibility only about 15-20 cm. As we’d like to see the koi, I’m looking into ways to clarify it. Mango 2 has recommended CaS204 to precipitate the clay. That may work, but our main issue seems to be phytoplankton. Under a microscope at about 50x, we can see small round green critters swimming around. They seem about .2 mm diameter (rough calculation using microscope onscreen grid) I’m pretty sure that they are Chlamydomonas algae, which are flagellates that do swim around. Can anyone shed light on this (without making our pond greener )?
If I store the water in the dark for two days, the greenness fades, which does support it being phytoplankton.
Not my picture. I don’t have a compound microscope, and so cannot zoom in quite this close. But videos online of Chlamydomonas swimming around do look a pretty close match what I’m seeing.
If I store the water in the dark for two days, the greenness fades, which does support it being phytoplankton.
Not my picture. I don’t have a compound microscope, and so cannot zoom in quite this close. But videos online of Chlamydomonas swimming around do look a pretty close match what I’m seeing.
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