Excel - buildup or dissipate? - The Planted Tank Forum
 
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post #1 of 10 (permalink) Old 02-08-2009, 04:41 PM Thread Starter
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Excel - buildup or dissipate?

I have question on using Excel for a carbon source.
Does Excel buildup or dissipate in the water column? CO2 of course will dissipate, so it needs added constantly during the daylight cycle. But I have not noted anywhere if Excel dissipates the same way since it's not a gas.


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post #2 of 10 (permalink) Old 02-08-2009, 05:49 PM
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According to Seachem the product dissipates within 24 hours of dosing, thus the recommendation to use it daily. There is a lot of good information available on their website.

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post #3 of 10 (permalink) Old 02-08-2009, 05:52 PM
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Here is another link about Excel by Seachem. http://www.seachem.com/Library/Artic...d_Aquarium.pdf

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post #4 of 10 (permalink) Old 02-08-2009, 07:42 PM Thread Starter
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Thanks

I was hoping it didn't dissipate in water and I could use Excel in my auto top off to auto dose cabon, but since my ATO is air powered I think most of the Excel would dissipate before it got to the tank.

-Rick


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post #5 of 10 (permalink) Old 02-08-2009, 07:46 PM
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Oh, in that case, you could still use it that way. It is the organics in tank water that cause the Excel (that hasn't been utilized by plants) to be broken down and dissipate. It doesn't "outgass" like CO2 does. If your topoff water is "pure" then there is no issue, you would be simply diluting it.

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Last edited by imeridian; 02-09-2009 at 06:15 AM. Reason: added clarification in italics
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post #6 of 10 (permalink) Old 02-09-2009, 04:53 AM
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One question I've had is Seachem's recommendation for an "overdosing" on water change days (5X the daily rate). I don't understand the need, and since adding amanos in the tank, I've been reluctant to follow their directions on this one. Anyone know the reasoning behind this, particularly when Excel presumably dissipates and the board is reset daily?
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post #7 of 10 (permalink) Old 02-09-2009, 05:48 AM
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I'm no expert, but i believe the reasoning is this: essentially, water changes are a way to 'reset' the tank... that being said by adding 5x the dose of excel you are bringing the levels of carbon back up in the tank after you do the water change. By then adding the daily dose you compensate for what the plants are using up. Thus keeping the carbon level constant. So it does not necessarily dissipate it is really just being used up and you are adding back what is used. The 5x dose on a water change day is to get the tank up to the proper levels...


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post #8 of 10 (permalink) Old 02-09-2009, 05:52 AM
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Quote:
Originally Posted by agutt View Post
I'm no expert, but i believe the reasoning is this: essentially, water changes are a way to 'reset' the tank... that being said by adding 5x the dose of excel you are bringing the levels of carbon back up in the tank after you do the water change. By then adding the daily dose you compensate for what the plants are using up. Thus keeping the carbon level constant. So it does not necessarily dissipate it is really just being used up and you are adding back what is used. The 5x dose on a water change day is to get the tank up to the proper levels...
Still confused, I guess, because if the presumption is that Excel is used up/dissipates such that it is "gone" after 24 hours, it would reset on a daily basis anyway, right? So in essence, each day is zero, and the 2 ml/20 gallons maintains the recommended concentration - hence, still don't know why the concentration on day 1 is different from concentration on all other days. Does this make sense?
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post #9 of 10 (permalink) Old 02-09-2009, 06:02 AM
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That looks like a good question for Seachem!

They have representatives active over at APC, would be good to ask about this.

FWIW, I also figure it's basically just restoring levels. If the tank doesn't have a lot of organics that the Excel is used up on, and the plants aren't using it fully, then there'll be some that builds up anyway. The extra dosing after a water change just helps make sure throughout the week that the daily dose is sufficient to meet the carbon needs, getting the overall level back up to where it would have been. That's all just supposition on my part though.

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post #10 of 10 (permalink) Old 02-09-2009, 11:42 AM
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Quote:
Originally Posted by imeridian View Post
That looks like a good question for Seachem!

They have representatives active over at APC, would be good to ask about this.

FWIW, I also figure it's basically just restoring levels. If the tank doesn't have a lot of organics that the Excel is used up on, and the plants aren't using it fully, then there'll be some that builds up anyway. The extra dosing after a water change just helps make sure throughout the week that the daily dose is sufficient to meet the carbon needs, getting the overall level back up to where it would have been. That's all just supposition on my part though.
Timely enough, this question has been on my mind and I asked Seachem via their site on Friday night, expect I'll get a reply today or so. I'll post it here once I do (or call them live, during business hours today).

Wasn't aware of their presence on APC - good to know. I'll dig there as well, interesting question.
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