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Old 11-27-2012, 03:57 PM   #1
HD Blazingwolf
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BarrReport post i wanted to share


Qoute : Tom Barr aka PlantBrain
""Why water change day seems to grow aquatic plants better
Basic simple question: why do my plants seem to grow better/best the day of the water change?

I do a large water change in the morning right after the lights come on, then late in the day, there is mad pearling and obviously better growth than any other day of the week.
I've measured plant growth to confirm this also. (stem length and biomass).
I've also done back to back water changes over the entire week, once a day, same time.

I've suggest a few hypothesis:

1. CO2 rich tap water. This is supported and suggested in the Optimum Aquarium(1986) from Dupla's Horst and Kipper, often around 20-30ppm ranges.
One can/could test this by allowing the water to sit for a 1-2 days to degas, then change the water.

Results, we still see an increase in growth.......but this is inconclusive.
I agree there is some strong effect here.

2. Temp differences within a sealed hot water heater and cooler tap water degas once released into the aquarium= cool water holds more gas, O2 and CO2 etc. Same issue as above, plenty of gases available to help growth. Test similar and similar results to above #1 as well.

3. Exposure to air. Plant aerenchyma (think a sponge in water and squeezed, and then out of water and squeezed) acts like a sponge and takes up lots of gas/air and then uses that while exposured during the water change. Larger water changes seem to produce this effect.
Test: large water changes by continuous drain and fill methods vs big drain and then refill after exposure. Seems to be plausible. Results suggest the same. You still need to allow and account for the degassing of the tap water also.

4. Indirect O2 addition= > drives bacterial cycling much faster= . indirect impact on plant growth.

5. Gas films. This was discussed by Ole in TAG, vol 23, No#1, pgs 32-39
A physical gill that improves submersed O2/CO2 exchange in some wetland species. If you add enough CO2, then the gas films do not have any difference in growth rates with/without the gas films(see Fig 7). This is similar to exposing the plants to air during the water change.
www.BarrReport.com

End Qoute!!!




i thought i'd add to this and share here, that my water degasses for a whole day now in a big garbage can. water is brought to close to room temperature and i replace 80% of the water in my sump and in my tank.
water is 76 degrees going in, tank is kept at 78/79

there is no extra oxygen as i jsut have a small pump in the garbage can.
water change is done without lights or co2 on but after the water change is done, plants look "better" i think we can all agree to this, no nutrients added, no co2, no lights, but my plants look awesome.

everything is turned on, lights hit and boom bubbles bubbles everywhere.
there is no saturated water for this to be fake pearling. and don't get me wrong my tank is a sodapop tank every day, but this is just madness



its a stupid hypothesis, but i think plants just like clean water too
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Old 11-27-2012, 05:19 PM   #2
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Agreed. It was an interesting read.

I also believe that trace minerals that might be in tap water could also supplement the minerals plants pull from the water column.

And I base this on absolutely nothing.
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Old 11-27-2012, 09:51 PM   #3
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Quote:
Originally Posted by HD Blazingwolf View Post
1. CO2 rich tap water. This is supported and suggested in the Optimum Aquarium(1986) from Dupla's Horst and Kipper, often around 20-30ppm ranges.
my tap water has 3ppm of co2.
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Old 11-27-2012, 10:01 PM   #4
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There was ample post discussion beyond the quote.

As mistergreen suggest....some tap will have more, and some will have less CO2........surface waters will almost all have lower CO2, well waters will generally all have higher CO2 content.

Some might provide a limiting nutrients, other tanks might not have any limitations..........

etc..........

In each case, there is a good chance that the aquarium looks better after wards.

O2 is almost always higher with tap and vat/reservoir water vs tank water unless it's done the latter 1/2 of the light cycle.

The other hypothesis is perhaps O2 demand by the tank water and consistent export of that, leaving more O2 available that would otherwise be used by micro inverts and bacteria to break down organic matter/waste.

Which could explain a lot regarding daily automated water change systems.
I've installed a few and they seem to be without any issues over long long time frames.

The gas film issue could also provide some insight/support into CO2 mist hypothesis.
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Old 11-27-2012, 10:04 PM   #5
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yes there was PLENTY of discussion but as im not a member i couldn't addon.. so i wanted to start the discussion here

and just to add my two cents. i completely agree plants look better.. oxygen? sure believeable
plants exposed to rfesh air also possible!
and maybe they like clean water too free of other stuff plausible as well

maybe its more a combination

but it is pretty apparent like you said tom, plants do like water changes
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Old 11-27-2012, 10:40 PM   #6
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Quote:
""Why water change day seems to grow aquatic plants better
Another theory could be entirely psychological. There is no evidence to support the quote.
Water changes are more beneficial for your fishes.
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Old 11-27-2012, 11:04 PM   #7
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Quote:
Originally Posted by mistergreen View Post
Another theory could be entirely psychological. There is no evidence to support the quote.
Water changes are more beneficial for your fishes.
if u read further on the barr report. tom states over a month period the growth difference is significant on tanks that had water changes 3-4x per week
vs tanks that had weekly maintenance
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Old 11-28-2012, 12:30 AM   #8
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Quote:
Originally Posted by HD Blazingwolf View Post
yes there was PLENTY of discussion but as im not a member i couldn't addon.. so i wanted to start the discussion here
You can be a member the same as you are here.

Subscriber is similar to the Bronze, silver and gold members here.
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Old 11-28-2012, 04:23 AM   #9
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Like Tom stated, it might be the case for a few but not the rest. This does not make it law.
You might win at a roulette table once but doesn't mean everytime you're at the table, you'd win.
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Old 11-28-2012, 09:18 AM   #10
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You know what else "pearls" after a water change? My glass, my heater, even my hands if I was rescaping.

And what do you mean by "Looks better"? It might just be that crystal clean water you just added.

I always thought that aquatic plants needed some time before showing an improvement on their health.
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Old 11-28-2012, 01:08 PM   #11
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Quote:
Originally Posted by FlyingHellFish View Post
You know what else "pearls" after a water change? My glass, my heater, even my hands if I was rescaping.

And what do you mean by "Looks better"? It might just be that crystal clean water you just added.

I always thought that aquatic plants needed some time before showing an improvement on their health.
my water is crystal before and after the water change.. i change 80% weekly. my filter pads bi weekly, and i fluff all my plants bi weekly to keep debris off them and into the filter pad
my water comes out almost as clear as when i put it in
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Old 11-28-2012, 02:00 PM   #12
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Quote:
Originally Posted by FlyingHellFish View Post
You know what else "pearls" after a water change? My glass, my heater, even my hands if I was rescaping.

And what do you mean by "Looks better"? It might just be that crystal clean water you just added.

I always thought that aquatic plants needed some time before showing an improvement on their health.
I think most advanced hobbyists can tell the difference between false pearling and true. The key is not the pearling, but is there real growth differences?
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Old 11-28-2012, 02:21 PM   #13
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More frequent water changes also helps to keep algae spores at bay.

Every tank I've seen that has an auto water change system is more forgiving and the plants grow like mad.
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Old 11-28-2012, 02:25 PM   #14
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Quote:
Originally Posted by AaronT View Post
More frequent water changes also helps to keep algae spores at bay.

Every tank I've seen that has an auto water change system is more forgiving and the plants grow like mad.
With Algae no doubt. If there is one universal 'truth' with all setups is that the water change helps, fish, plants, scape. As long as the plants have what they need to grow the water change is the key.
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Old 11-28-2012, 02:29 PM   #15
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It's the speculation in the water that makes the plants look so good.
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