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Old 04-24-2006, 11:48 AM   #11 (permalink)
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I don't know about either of those theories... I could buy it if I had well water (used to have a well in VA that had so much CO2 in it that it was corroding the copper pipes in the house...), But I make 15-20 gallons of RO, stored with little exposure to the atmosphere - The RO certainly doesn't have a whole-lot of O2 or CO2 in it... yet, when I do a change I get massive pearling also.

Could it be that the redox of the water replaced is much higher than what is pulled out, and hence the plants respond/photosynthisize better?

(that's my theory and I am sticking to it ).

- Jeff
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Old 04-24-2006, 11:31 PM   #12 (permalink)
 
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Quote:
Originally Posted by taekwondodo
RO, stored with little exposure to the atmosphere ... when I do a change I get massive pearling also.
I have the same results. My tank is anything but not CO2-llimited.

I also niticed that "pearling" comes from unclean parts of glass even if I use RO water. It seems that gass from aquarium water comes out, or some gasses comes in while new water contacts with old aquarium water, involding a lots of bubbles.
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Old 04-25-2006, 09:03 AM   #13 (permalink)
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Well, here's my theory. A lot of us have chloramines in the tap targeted to 2-4 ppm Cl (http://www.reefkeeping.com/issues/20...ure/index.php). 3 ppm Cl gives 1.18 ppm N. Assuming the dechlorinator complexes with the ammonia in a bioavailable way, that is effectively adding 5ppm-NO3 but in a much higher energy form, NH3. I think a large W/C is a good shot of energetic nitrogen just due to breakdown of the chloramine.

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Old 04-25-2006, 09:18 AM   #14 (permalink)
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Doesn't fit why someone with RO gets massive pearling when a change happens (i.e., no Chlorimines). I'm stuck on the redox theory...
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Old 04-25-2006, 09:43 AM   #15 (permalink)
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Quote:
Originally Posted by taekwondodo

Could it be that the redox of the water replaced is much higher than what is pulled out, and hence the plants respond/photosynthisize better?

(that's my theory and I am sticking to it ).

- Jeff
What do you mean by redox of the water?

I think JLudwig has a valid point. I'm guessing I do have chloramine in my water since my water is Boston city water. But would the plants absorb and react that quickly to NH3? Is it safe for the fish? I'll have to check my dechlorinator when I get home because it might be a brand that binds the NH3. If this is the case, we're back to square one.

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Old 04-25-2006, 01:55 PM   #16 (permalink)
 
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Here we go again, some one wants to suggest the NH4 is helping, well, add some NH4 if you feel that sure. Newbies and folks that are not careful, don't bother, you'll kill off all your fish and have a nasty algae bloom. I have tanks without fish to do stuff like this.

RO water change still have a fair amount of CO2, even if it's removed fast, it still gives a nice boost, but that's not the 1/2 of it nor the significant part.

When you do a large water change, do the plants get exposed to the air or not? How do you think that effects the plants in terms of CO2 if they are limited prior?


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Tom Barr
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Old 04-25-2006, 02:17 PM   #17 (permalink)
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Tom,

My tank is normally pH of 6.3/6.4 with a dKh of 4-5 (estimate 50-60ppm - I had the pH down to 6.0 a while back and the glosso was growing tall (220W PCFs)). The RO water probably lessens the CO2 amount in the tank (I doubt the RO is over 50ppm CO2...).

Other than increasing the redox (no, I don't measure it, just a guess) the only other thing I can think of would be the increase in O2 (I pour the water in...).

- Jeff
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Old 04-25-2006, 02:37 PM   #18 (permalink)
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How about this..... You'll see pearling when a liquid becomes saturated with a gas. When the gas comes out of solution it usually forms on an irregular surface. Ever try to boil water in a perfectly smooth container? New water can induce pearling for a number of reasons. If it contains a ton of CO2 and your tank is generally carbon limitted, the plants get a rapid "shot in the arm" and start cranking out O2, which saturates the water and you see pearling. If the water you add is saturated in O2 (or even supersaturated) you might get pearling. If the water you've added contains something that your tank was deficient in, plant metabolism will increase and you'll see pearling.
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Old 04-25-2006, 02:42 PM   #19 (permalink)
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Quote:
Originally Posted by plantbrain
Here we go again, some one wants to suggest the NH4 is helping, well, add some NH4 if you feel that sure. Newbies and folks that are not careful, don't bother, you'll kill off all your fish and have a nasty algae bloom. I have tanks without fish to do stuff like this.
I do plan on adding NH4, I'm quite confident my plants and biofilter can handle it and even if something terrible algae-wise happens I know how to take care of almost anything, just requires patience and elbow grease.

Jeff
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Old 04-25-2006, 08:28 PM   #20 (permalink)
 
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Can it be because of temperature difference?
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