Water changes - The Planted Tank Forum
 
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post #1 of 3 (permalink) Old 11-30-2014, 11:26 PM Thread Starter
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Water changes

A fellow member pointed me here to read up on dosing fertz, which i have. The one thing i have a question on is water changes. I keep reading that a 50% water change needs to be done per week. I have been under the impression that only a 25% needs to be done for freshwater. Is it different with planted tanks?
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post #2 of 3 (permalink) Old 12-01-2014, 12:08 AM
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No set amount is correct.

Non-planted tank: Monitor the NO3 and do enough water changes (volume and frequency) to keep the NO3 no higher than 20 ppm.

Planted tank: Depends on the fertilizer program, but if you are following the EI method, then it calls for 50% once a week.
If you modify that, you may be just fine with smaller water changes.

Walstad style tanks generally get much smaller water changes, infrequently.
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post #3 of 3 (permalink) Old 12-01-2014, 12:12 AM
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Can't go wrong with a weekly 50% assuming your source water is somewhat normal.. not everything is detectable by standard liquid test kits..
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