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Old 08-30-2011, 05:20 PM   #1 (permalink)
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Default UV sterilizers and Excel

Do UV sterilizers have any effect on the efficacy of Flourish Excel?
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Old 08-31-2011, 01:25 AM   #2 (permalink)
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Default Re: UV sterilizers and Excel

I don't think the UV light causes the excel to react.

Since Excel is basically modified glutaraldehyde I searched for that.

I found an article that says glutaraldehyde's absorption spectrum is 280 nm. UV light goes from 10-400 nm, and our aquarium bulbs emit UV C, which is 280 nm light. So the UV sterilizer light is being absorbed by glutaraldehyde (heating it up). However, since the concentration of glutaraldehyde is very low in the fish tank and it is surrounded by cooling water, I doubt it reacts. Also, I did another search for UV and glutaraldehyde and couldn't find any reactions where UV light and glutaraldehyde produced some chemical reaction.

I am curious why do you ask about excel and UV lights?


http://www.sigmaaldrich.com/etc/medi...p/g6403pis.pdf
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Old 08-31-2011, 05:26 AM   #3 (permalink)
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Default Re: UV sterilizers and Excel

Hey Zapins, thanks for the help. You are correct, UV sterilizers will not have any negative impact on Flourish Excel.
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Old 08-31-2011, 05:55 AM   #4 (permalink)
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Default Re: UV sterilizers and Excel

[QUOTE=Zapins;604417]

I am curious why do you ask about excel and UV lights?


I have a 4gal. Finnex NPT that I want to add some fish to. I would like to be able to run a UV sterilizer on this tank so I can treat the inevitable Ich outbreaks. Having crystal clear water would be a nice bi product of a UV sterilizer as well. Also, I would like to have the option of using Excel as a source of carbon for my plants.

Thanks for your detailed reply, Zapins and thanks also to Seachem.


Kim
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Old 09-01-2011, 04:39 AM   #5 (permalink)
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Default Re: UV sterilizers and Excel

We are always happy to help, just let us know if you have any additional questions.
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Old 05-02-2019, 09:37 AM   #6 (permalink)
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Default Re: UV sterilizers and Excel

I too am searching for a clear cut answer to the question of how UV sterilizers and Seachem Excel interact or if they even do. It seems there are conflicting answers from Seachem reps.

I just became a member today and am happy to be here

Just before reading this conversation in these forums I was here https://www.seachem.com/support/foru...-the-use-of-uv where a member of the Seachem forums had asked about UV light interactions with Seachem Iron and Seachem Excel.

Here is the copy/paste quote from the Seachem tech in reference to Excel: "Hello,
Flourish Iron is in a form that is readily available to the plants to uptake. It is not in a form that is particularly sensitive to UV light. Flourish Excel can be degraded faster by the use of UV light."

I am very interested in finding a solid answer to this question.
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Old 05-02-2019, 10:09 AM   #7 (permalink)
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Default Re: UV sterilizers and Excel

Quote:
Originally Posted by KimberlyTRzz View Post
I too am searching for a clear cut answer to the question of how UV sterilizers and Seachem Excel interact or if they even do. It seems there are conflicting answers from Seachem reps.

I just became a member today and am happy to be here

Just before reading this conversation in these forums I was here https://www.seachem.com/support/foru...-the-use-of-uv where a member of the Seachem forums had asked about UV light interactions with Seachem Iron and Seachem Excel.

Here is the copy/paste quote from the Seachem tech in reference to Excel: "Hello,
Flourish Iron is in a form that is readily available to the plants to uptake. It is not in a form that is particularly sensitive to UV light. Flourish Excel can be degraded faster by the use of UV light."

I am very interested in finding a solid answer to this question.
Welcome to APC! I read all of the posts on this subject and I can't see any conflicting Seachem replies. We have known for some time that Excel has only about a 24 hour life in our aquariums, which is why most of us dose it daily. We usually ignore Seachem's 5 ml/10 gallons initial dose recommendation, and dose 2 ml/10 gallons every day, including water change days. I have been doing that, and it worked for me. Of course, even DIY CO2 is much more effective as a carbon source than Excel, but dosing Excel and using DIY CO2 works fine - the Excel helps avoid algae problems, while the CO2 is encouraging faster plant growth.
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Old 05-02-2019, 10:55 AM   #8 (permalink)
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Default Re: UV sterilizers and Excel

Hello and thank you so much for the welcome and the reply!

I've been reading more about this since posting this morning and I found another reply (plantedtank.net) to the UV-Excel question that came directly from a Seachem rep to a user who contacted them directly.

"i contacted seachem and this is what they said about using a sterilizer with excel"

Hello,
Yes, UV sterilizers have the potential of breaking down the active ingredients in Flourish Excel; therefore, we recommend turning off UV when dosing Excel and leaving it off for about 4 hours. Please let us know if you have further questions.
Seachem Support 10208

I'm thinking dose Excel in the morning before lights on and run the UV after lights out.

Last edited by KimberlyTRzz; 05-02-2019 at 11:05 AM..
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Old 05-02-2019, 03:28 PM   #9 (permalink)
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Default Re: UV sterilizers and Excel

Excel's limited life in an aquarium may be a result of light affecting it. I don't recall reading exactly why it has such a short life.
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Old 05-02-2019, 04:38 PM   #10 (permalink)
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Default Re: UV sterilizers and Excel

Hmm. If one was to dose Excel primarily for algae control, would it make any sense to dose at the start of the dark period? Dumb question?

Last edited by ObiQuiet; 05-02-2019 at 05:18 PM..
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