Time of Day for a Water Change? - The Planted Tank Forum
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post #1 of 16 (permalink) Old 05-05-2012, 08:41 PM Thread Starter
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Time of Day for a Water Change?

So, Im guessing its better to do water changes at night, sooner to when the lights shut off. Since plants prefer more O2 at night and doing water changes introduces more O2 into an aquarium, especially one that is supplied with pressurized Co2 and causes a rise in my ph due to saturation levels of both O2 and Co2 flip flopping. I do run my Co2 24/7, so the ph swing shouldnt be as lengthy if I do the W/C closer to lights out. Does this sound right?


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post #2 of 16 (permalink) Old 05-05-2012, 09:35 PM
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I prefer and so does my ecosystem about an hour or two before lights on. I only run c02 during the day.. i have recently been doing it at night because of scheduling constraints and things just dont seem to be working as well.

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post #3 of 16 (permalink) Old 05-05-2012, 09:43 PM
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The PH swing doesn't matter. I do it whenever I can. It doesn't matter.
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post #4 of 16 (permalink) Old 05-05-2012, 10:19 PM
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I do mine on sunday nights at 7:00-8:00 in the evenings. works well for me. and the plants do not seem to matter.


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post #5 of 16 (permalink) Old 05-05-2012, 10:25 PM
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I dunno man. I heard 3:26pm is best except on Saturdays when you'll want to stick to a 6:18am schedule to reduce stress.


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post #6 of 16 (permalink) Old 05-05-2012, 11:14 PM
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I dunno man. I heard 3:26pm is best except on Saturdays when you'll want to stick to a 6:18am schedule to reduce stress.
I almost believed you were being serious at first. I do water changes everyday. I let the water run for about 3hrs.
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post #7 of 16 (permalink) Old 05-06-2012, 01:27 AM
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im fairly new to this hobby but idk, i think you're just over-thinking this. just do a water change whenever you feel. it's what ive always done and nothing bad has ever happened.

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post #8 of 16 (permalink) Old 05-06-2012, 01:48 AM Thread Starter
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I dunno man. I heard 3:26pm is best except on Saturdays when you'll want to stick to a 6:18am schedule to reduce stress.
Oh, that makes perfect sense! Thanks man

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im fairly new to this hobby but idk, i think you're just over-thinking this. just do a water change whenever you feel. it's what ive always done and nothing bad has ever happened.
Lol, thats what I do best, not always a good thing. Just want to try and maximize the balance of my tanks as efficiently as possible. Since I have alot of variety. I try and do 40-50% w/c's twice a week. Like you said I mayb overthinking but always good to get the consensus of the public.


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post #9 of 16 (permalink) Old 05-06-2012, 02:05 AM
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I do 50% water changes twice a week as well, and I usually do them right in the middle of the day.

Honestly, I never even though about it. What you said does make sense to me, but I've never seen any ill effects from just doing it whenever it suits me.

I work from home, so I don't have any hard schedule to work around, but if you have to choose between morning and evening due to work constraints, I'd probably choose evening.

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post #10 of 16 (permalink) Old 05-06-2012, 02:51 AM
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Just kidding man. I do water changes whenever I feel like it, except when the lights have been out for a while. I've only seen the fish perk up and everything look good, so I've never really thought about it.


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post #11 of 16 (permalink) Old 05-06-2012, 04:37 AM
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I figure that the water change that actually gets done is better than the one that doesn't get done because I'm trying too hard to time it perfectly.

Seriously, try not to overthink it (and this is coming from someone who overthinks almost everything!) Just do the best you can.


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post #12 of 16 (permalink) Old 05-06-2012, 04:46 AM
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If you change anything, try to change to no CO2 when the lights are out. There is an advantage to starting the CO2 an hour before the lights come on, and stopping it an hour or less before the lights go out. CO2 running at night just overstresses the fish.

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post #13 of 16 (permalink) Old 05-06-2012, 04:49 AM Thread Starter
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Originally Posted by kcartwright856 View Post
I do 50% water changes twice a week as well, and I usually do them right in the middle of the day.

Honestly, I never even though about it. What you said does make sense to me, but I've never seen any ill effects from just doing it whenever it suits me.

I work from home, so I don't have any hard schedule to work around, but if you have to choose between morning and evening due to work constraints, I'd probably choose evening.
Yeah I usually do it in the middle of my tanks day.

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Just kidding man. I do water changes whenever I feel like it, except when the lights have been out for a while. I've only seen the fish perk up and everything look good, so I've never really thought about it.
I know man, had to give you a hard time back

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I figure that the water change that actually gets done is better than the one that doesn't get done because I'm trying too hard to time it perfectly.

Seriously, try not to overthink it (and this is coming from someone who overthinks almost everything!) Just do the best you can.
Yeah definitely important to change water and really dont have a issue making time to do so because to me its something that has to be done! If not Im gonna make more work for myself later.

Im just mostly wondering if it would be more beneficial and would lessen stress due to ph,swings. Not that they are a issue, my swings are minor. Just curious more than anything.


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post #14 of 16 (permalink) Old 05-06-2012, 12:26 PM
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So, Im guessing its better to do water changes at night, sooner to when the lights shut off. Since plants prefer more O2 at night and doing water changes introduces more O2 into an aquarium, especially one that is supplied with pressurized Co2 and causes a rise in my ph due to saturation levels of both O2 and Co2 flip flopping. I do run my Co2 24/7, so the ph swing shouldnt be as lengthy if I do the W/C closer to lights out. Does this sound right?
Running your c02 24/7 creates a lot of 02. Remember 02 is a waste product of photosynthesis.
In natural habitats water is constantly changed. In other words it doesn't matter when you change water.
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post #15 of 16 (permalink) Old 05-06-2012, 04:47 PM Thread Starter
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Good point, also got to think about the fish air exhange as well and guess it really doesnt matter. Also, just tested my ph before lights come on and not much of a swing even given the W/C's last night.

So, the consensus is that it doesnt matter and Im overthinking lol.


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