The Planted Tank Forum - View Single Post - where to buy quality OEBT's?
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Old 12-04-2012, 04:40 PM   #13
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Poor nutrition usually is the cause of OEBT discoloration, (Assuming it was deep blue as an adult)

I believe it is one of the trace minerals that they add to the food that account for the blue coloration, but I forget what.

Other causes could be pH is too low, OEBT like a slightly higher pH than other Card. shrimp.

Might also be stress from ammonia or temperature.
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