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Old 07/27/2013, 05:44 PM   #13
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Join Date: Mar 2002
Location: Mountain View, CA, USA
Posts: 86,570
Dinoflagellates can be a problem in a lot of places. In the ocean, nutrient levels and temperature can play a role in the blooms. On the other side, there are lots of organisms and viruses that attack microbes, too.

For the lights-out treatment to work, you might need to do a lot of nutrient control when the dinoflagellates start dying. Water changes, GFO, and carbon might help. I agree that the dinoflagellates are likely to return if there's an underlying problem.

Some people do seem to be successful with hydrogen peroxide, too.

Jonathan Bertoni
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