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Old 04-19-2018, 11:43 AM   #1
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How often should I perform water changes?

I have 125 gallon tank with 9 juvenile cichlids and 2 plecos. I have 2 marineland emperor 400 filters. How often should I perform water changes?
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Old 04-19-2018, 11:59 AM   #2
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Several factors to consider, such as the amount you feed, size of your fish, etc...
You can't go wrong with weekly 50% water changes regardless.
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Old 04-19-2018, 12:01 PM   #3
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IMO, one should change out 50% of the tank water every week. Maybe 2x 30 gal.WC a week, with thorough gravel vacs.
Review threads from BBradbury, AA' s resident water management guru. He has very informative tips regarding water management.
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Old 04-19-2018, 12:51 PM   #4
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Hello T...

Water changes should really be done weekly and half the tank volume in gallons is recommended. Though, more is always better when it comes to changing the tank water. In short here's why: The trace elements in water change the longer it runs through a filtering system. Water when exposed to nitrogen from fish waste and nitrogen in the air reduces oxygen. Fish and plants also use trace elements to stay healthy. The longer water stays in the tank, the more it changes. By removing and replacing most of it weekly, you can maintain the best water chemistry for the fish and plants.

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Old 04-19-2018, 01:09 PM   #5
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Hello T...

Water changes should really be done weekly and half the tank volume in gallons is recommended. Though, more is always better when it comes to changing the tank water. In short here's why: The trace elements in water change the longer it runs through a filtering system. Water when exposed to nitrogen from fish waste and nitrogen in the air reduces oxygen. Fish and plants also use trace elements to stay healthy. The longer water stays in the tank, the more it changes. By removing and replacing most of it weekly, you can maintain the best water chemistry for the fish and plants.

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Thank you for the feedback. Are there certain chemicals I should use during the water change?
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Old 04-19-2018, 01:35 PM   #6
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Thank you for the feedback. Are there certain chemicals I should use during the water change?


You need a dechlorinator. I recommend Seachemís Prime.
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Old 04-19-2018, 01:38 PM   #7
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You need a dechlorinator. I recommend Seachemís Prime.
You guys are amazing. I love this group. Thanks for everything.
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Old 04-19-2018, 01:52 PM   #8
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Hello again T...

You only need to use one of the products that removes chlorine and chloramine and also detoxifies forms of nitrogen like ammonia and nitrite. I use Seachem's "Safe", but there are others. I prefer to treat the tap water before it goes into the tank.

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Old 04-19-2018, 02:14 PM   #9
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How often should I perform water changes?

However, if treating the water beforehand isnít an option, you can certainly add the total amount of dechlorinator needed to treat the entire tank before you add water. I use a Python water changer, so Iíve always treated the tank before the new water is added.
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Old 04-19-2018, 02:23 PM   #10
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However, if treating the water beforehand isnít an option, you can certainly add the total amount of dechlorinator needed to treat the entire tank before you add water. I use a Python water changer, so Iíve always treated the tank before the new water is added.
Ok I got it. How do I ensure the added water is the right temperature?
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