How to do weekly water changes on non-CO2?
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Old 09-23-2008, 12:48 AM   #1
KDahlin
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How to do weekly water changes on non-CO2?


I've been wondering how to do weekly water changes on my non-CO2 24 gallon tank without inducing algae produced by the CO2 spike from the tap water. I want to do water changes partially because the tank is fairly heavily planted and when I feed my dwarf cichlids they often don't see all the food. I also want to do water changes because I think a tank that has regular frequent water changes looks better (I've seen this in my CO2 tanks).

I was amazed at how clear and clean-looking the non-CO2 tank was that Brette linked to: http://www.plantedtank.net/forums/lo...-tank-web.html
so I asked Oliver how often and how much he changed the water and he said every week 15%. How do you think he does it without inducing algae brought on by the CO2 spikes? I sure don't see any algae in his beautiful tank.
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Old 09-23-2008, 01:17 AM   #2
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I've often done water changes on non-CO2 tanks, and never had an algae bloom afterwords. Then again, I'm pretty sure my water doesn't have elevated levels of CO2.

Do you have any reason to suspect your tap has high levels of CO2?
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Old 09-23-2008, 01:34 AM   #3
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I do about 20% every 2 weeks on my low tech (non-CO2-injected) tanks. I've never worried about CO2 level fluctuations from water changes; my tanks are well-circulated and have HOBs with waterfalls/biowheels, so I don't imagine the levels fluctuate that much.
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Old 09-23-2008, 01:35 AM   #4
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the way i avoid the problem is by maintaining very good circulation, and therefor gas exchange. by keeping the co2 level similar to what is in the air, you eliminate the difference between the tank water and the water you are adding (or so it seems to me)
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Old 09-23-2008, 01:47 AM   #5
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never heard of a co2 spike after water change, i have 3 tanks without co2, do 20-30% every 2 weeks with no problems.
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Old 09-23-2008, 01:51 AM   #6
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Do them at night after lights-out... Problem solved
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Old 09-23-2008, 02:13 AM   #7
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Huh! This is very enlightening! I must have algae problems for another reason. That's really interesting to hear that other people do frequent water changes in non-CO2 tanks without algae problems. Now I don't know what to think...
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Old 09-23-2008, 02:15 AM   #8
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Quote:
Originally Posted by KDahlin View Post
Huh! This is very enlightening! I must have algae problems for another reason. That's really interesting to hear that other people do frequent water changes in non-CO2 tanks without algae problems. Now I don't know what to think...
I do the same. Just drain the water and fill'er back up without problems. Although I do dose 1.5x Excel when I do WCs on every tank I do. It's become habit. Maybe that helps a little bit? No clue.
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Old 09-23-2008, 02:23 AM   #9
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Well, maybe I misread this article. That's what I took away from it: http://www.barrreport.com/articles/4...2-methods.html
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Old 09-23-2008, 02:26 AM   #10
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Quote:
Originally Posted by Tom Barr
Doing water changes adds CO2 back to a CO2 limited tank.
Plants and algae both can and do adapt to low CO2 environments and induce genes to make enzymes that concentrate CO2 around Rubisco, the CO2 fixing enzyme. When we add the CO2 at higher levels back, this causes the plants and algae to destroy the low CO2 enzymes and start growing without of them since they no longer need them to fix CO2 form the KH ( the -HCO3).
Why keep all this machinery around if you no longer need it? Doing weekly water changes "fools" the plants and helps encourage algae more. Algae are faster to respond to low CO2 than plants.
Once the plants do adapt, they can do well.
Interesting. If you do water changes with plenty of surface turbulence, is the level of CO2 in the aerated tap water still much greater than the level of CO2 in a non-injected tank? And what if you do WCs with less volume. Maybe 2-3 gallons vs. 4-5 gallons in a 24 gallon tank?

Maybe Barr will chime in on PT.
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Old 09-23-2008, 03:07 AM   #11
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as i understand it, excel and non excel are two completely different setups
my excel tank has no issues with algae when i do water changes where as my non-excel tank did until i took the hood off, hung the light and increased surface agitation.
my next setup is going to be non co2, non excel but with a wet-dry filter...has to wait till Christmas vacation though
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Old 09-23-2008, 03:21 AM   #12
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Quote:
Originally Posted by discuscardscorys View Post
as i understand it, excel and non excel are two completely different setups
my excel tank has no issues with algae when i do water changes where as my non-excel tank did until i took the hood off, hung the light and increased surface agitation.
my next setup is going to be non co2, non excel but with a wet-dry filter...has to wait till Christmas vacation though
I have experimented with Excel on this tank and was unable to see a difference.
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Old 09-23-2008, 04:22 AM   #13
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15% water change really isn't that much.

and an easy way to lower your changes of an algae outbreak is not have too much light.
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Old 10-19-2008, 08:24 AM   #14
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i do about %70 water change every week on my low-tech no co2 60 gallon tank. and no algae bloom what so ever, and the tank looks super clean and clear after every change. could be my tap water? i dont know i never check any of the water paremeters.
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Old 10-19-2008, 12:15 PM   #15
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I would assume that a large ammount of the CO2 is outgased when the water splashes from the faucet into the bucket, when Prime is added and everything stirred etc.

And even if not: assuming that you don't have *really* elevated leves of CO2 in your tap water, there will hardly be a spike...a spike looks like this: ^
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