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Old 03/21/2017, 04:21 PM   #4147
RC Mod
Join Date: Mar 2002
Location: Mountain View, CA, USA
Posts: 87,169
I agree that the dinoflagellates might be outcompeting the Chaetomorpha for nutrients. The dinoflagellates might be producing a toxin that affect the alga, as well. It's hard to be sure, but problems like that are common. You might consider trying fresh carbon to see whether that helps, but that often seems to be a losing battle.

Jonathan Bertoni
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