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Old 20-07-2017, 07:34 PM   #1
Natureman
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Join Date: Jun 2003
Posts: 1,204
Default How to know when to WC

How u know when to do WC of tanks?

Some hobbyists swear by smell of water.

Professional ones will test nitrate levels and decide.

I test water TDS meter. Just dip TDS meter into water and check reading. If high TDS then time to WC. Also will let me know how much to change.
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