The Planted Tank Forum - View Single Post - When CO2 strikes: killing all my fish
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post #9 of (permalink) Old 04-28-2012, 05:59 AM
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Truth be told, I almost had this happen once but just before it was too late I discovered that I did in fact have cherry shrimp in my tank. I didn't know I had them in the tank (it was full of large rainbows) but when the co2 was too high they were the first to the surface, where I discovered them.

It looks like cherry shrimp can be somewhat early indicators.
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