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Old 07-21-2017, 02:55 AM
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G.Alexander G.Alexander ثeu
Join Date: Jan 2005
Posts: 35,488

Difficult to say what has caused the TN but it is often a imbalance of elements. Firth think I would try are three water changes each 15- 20 % within 10 days.

Have you changed anything else, which kind of carbon do you use ?

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