210 Water Changes

  • We are currently upgrading MFK. thanks! -neo
To answer your question about water changes. Large water changes performed less frequently remove far more toxins than smaller water changes performed more frequently.

Assume a weekly nitrate accumulation of 20 ppm for each example below.

A 25% weekly WC results in 60 ppm nitrate after each WC, 80 ppm before each WC, 70 ppm average.
A 50% weekly WC results in 20 ppm nitrate after each WC, 40 ppm before each WC, 30 ppm average.

A 50% WC every 2 weeks results in 40 ppm nitrate after each WC, 80 ppm before each WC, 60 ppm average.
A 75% WC every 2 weeks results in 13 ppm nitrate after each WC, 53 ppm before each WC, 33 ppm average.

Note that 50% every 2 weeks beats out 25% once a week.

https://www.hamzasreef.com/Contents/Calculators/EffectOfWaterChanges.php
I’m okay with doing 50% every week. I was just wondering if I could do 25-35% biweekly. Does it matter if I perform WC from dp or sump? Which is note effective.
 
Once your fish get bigger, you will definitely need to do larger water changes. For now though, you will probably be fine with 50% every two weeks, in my opinion. Then you will have to just keep an eye on your parameters and increase the water changes as needed due to the fish growing.

I have a 220 with two 24” fire eels, one 15” fire eel and two 13” vulture catfish. I only feed once every three days and do about a 90% water change every weekend. I do the same for my 29 gallon grow out tank and my son’s ten gallon glofish tank. I change out about 300 gallons of water every weekend.
 
AAV...

Testing the tank water is important if you're cycling a tank, because you need to know when to change the tank water. Once the tank is established, you set up and follow an aggressive water change routine to maintain healthy water conditions. By simply removing and replacing most of the tank water weekly, you guarantee a steady water chemistry. There's really no need to test the water once you've established your aggressive water change schedule and follow it. This is just one of several steps that can be omitted, so tank management can be more streamlined and efficient. This way,there are fewer things to remember to do.

TTG
 
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What did you cycle the tank with? You might need to add more B.B. in the bottle. I personally like stability and use it for all my new tanks. Also I would cut way down on the water changes until you sure your reading a measurable amount on your test strips
 
Your fighting the cycle with the frequent large water changes. Cut them back and monitor the parameters more until your sure the cycle has completed.
 
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