Uv light and ei dosing - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 09-15-2015, 09:34 PM Thread Starter
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Uv light and ei dosing

Does uv light has any effect on the ferts that we use?
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post #2 of 7 (permalink) Old 09-15-2015, 09:57 PM
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It has an effect on DTPA iron. I think I was losing around .1 ppm every 24 hours after testing my water. I used the Hannah HR Iron (egg looking one ) checker for testing and I was running my UV 24/7. I ended up not using the UV for now as I try to sort out some issues with my trace.

I'm not completely sure if it affects the trace elements in Plantex CSM+B but I will find out soon.


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post #3 of 7 (permalink) Old 09-16-2015, 10:01 PM
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With EI dosing I would think there is enough residual that it wouldn't matter.
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post #4 of 7 (permalink) Old 09-17-2015, 04:11 AM
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PortalMasterRy - did you continue testing after stopping the UV?

I had real issues keeping iron up also (and incidentally had a in-filter UV going but wasn't thinking about it).

I finally did a bunch of calibration tests and found my reagent, despite being new, was simply bad. I also found some tests (Seachem in particular) take a VERY long time to register DPTA, much longer than they say for "chelated" iron as they only tested ETDA (they confirmed this on their forum). I'm finding I need about 4 hours to get a good reading not the 45 minutes it suggests.

With fresh reagent and careful testing I found I was substantially overdosing iron, brining it up to almost 2ppm instead of the 0.1ppm I was aiming for. It still gets consumed fairly quickly, but nowhere near as much as I thought.

Personally I'd suggest anyone testing carefully mix a known solution up for the target you are aiming for (all it takes is a few drops in a bucket) and test that before assuming your tests are good.

So I'm really curious how sure you are that it affected DTPA iron? I'm not saying it didn't, but this is the first time I've seen that, and I'm concerned as my UV's are on all the time.

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post #5 of 7 (permalink) Old 09-17-2015, 04:45 AM
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Quote:
Originally Posted by Linwood View Post
PortalMasterRy - did you continue testing after stopping the UV? .
Yes and I actually ended up hitting 1.1+ ppm iron (vs .6 ppm) in less than a few days because I was dosing both .01 Boron with .1 ppm Fe from a special CSM+B/10% DTPA Fe mix plus an additional .1 ppm 10% DTPA every day. I had to stop dosing the additional Fe because .2 ppm/day would yield me about 1.6+ ppm Fe at the end of the week.

I think I was losing more iron when I was running the UV 24/7. I decided at one point to turn off the UV during the photo period only and I remember I was still losing .1 ppm Fe a day.

Also after completely abandoning my UV, I was able to hit 2.5+ Fe PPM this week. Half of my rotala's are now stunted. Don't know if this was either my 1:1 Ca/Mg Ratio @ 40 PPM, 100 PPM K, too much trace or too high Fe.

Also I remember finding a discussion on another site where a guy tested his Fe levels and found he was losing around .1 ppm a day while running the UV 24/7.


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post #6 of 7 (permalink) Old 09-17-2015, 04:49 AM
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Thank you. I need to experiment a bit. I'm also recovering I think from stunted rotala's (tiny leaves) and not sure what caused it, also Wisteria just stopped growing at all, no new growth after previously going nuts. Yet Crypts and Val's are going nuts, growing like mad.

One aspect of this is that iron of course can't be destroyed by UV light, only the chemical form could be changed. So if we are dumping in a lot of chelated iron and it's becoming unavailable, it has to go somewhere -- wonder where it goes.

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post #7 of 7 (permalink) Old 09-17-2015, 03:37 PM
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Another thing to keep in mind is that if the crypts and vals are going nuts, there might not be as many nutrients for the wisteria. Not that this is necessarily the issue, but just a thought.
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