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Old 09-24-2012, 08:29 PM   #1 
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Join Date: Jun 2012
Water changes for a cycled tank

I have a 3 gallon fully cycled tank. Only took 4 months ;)

How often should I be doing water changes now? I've been doing 50% twice per week but it's getting a bit hectic over here with school starting back up.

Thanks :D
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Old 09-25-2012, 01:23 AM   #2 
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You need to test for ammonia and perform a water chage when you get ammonia reading.
For a 3 galon cycled I would say 1 25-50% change per week will do but you really need to monitor that ammonia.
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Old 09-25-2012, 05:04 AM   #3 
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if it's cycled... you do whatever WC neccessary to reduce ur nitrates to be sustained at a safe level...
ur nitrate should be max 20ppm at every weekly WC
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Old 09-26-2012, 08:04 AM   #4 
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Besides nitrates, a weekly water change also removes DOCs which are not removed by the filter. (DissolvedOrganic Compunds like pheromones and other things I'm not really clear on)

I do a 50% weekly change in my 2.5g and 3g tanks. Some keepers do more. With just a few slow-growth plants, my nitrates never exceed 10ppm.
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Old 09-29-2012, 11:52 PM   #5 
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Smaller volumes of water tend to have less stable water chemistry so you should rely on testing for a tank of about 3 gallons.
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Old 09-30-2012, 12:04 AM   #6 
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Location: Coastal Georgia
Here...OFL just posted's great!
All about water change schedules!
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