Can anyone figure this one out?? - The Planted Tank Forum
 
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post #1 of 12 (permalink) Old 10-23-2004, 10:24 AM Thread Starter
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Can anyone figure this one out??

I just can't figure out what is going on...

I've been working on getting a good dosing regimen going and been dosing (and testing) regularly with Plantex, KH2PO4, K2SO4, KNO3.

On Thursday, 21/10, I had a PO4 reading of around 0.6 to 0.7. Did not dose PO4 (only dosed 5mg/l NO3).

Yesterday, I bought and installed a new Eheim 2026 because I had been feeling for a while that my "built-in" filter on the 200l tank was just not circulating enough water and not doing such a great job at mechanical filtration.

This morning I tested PO4 and came up with 3.5-4 mg/l!! . I retested and even created a control solution and tested against that: PO4 test is ok.

So what in the world has suddenly raised my PO4 level like that??

In the 2026 I put (in order of filtration) Eheim's "noodles", coarse sponge (that came with the filter), JBL MicroMec sintered glass balls (a product that I've been using for over a year), then JBL filter floss and finally the white pad that came with the filter.

Could it be that previously the circulation was so bad that "pockets" of PO4 were in the aquarium and not being measured and that with the improved circulation the test kit is now picking this up? Or can a filter material carry phosphates?

Seems far-fetched but I can't think of anything else? Anyone else?
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post #2 of 12 (permalink) Old 10-23-2004, 12:38 PM
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Hmmm... even though I am not an Eheimpimp I can pretty much guarantee it is not the filter, although I must admit, I have no clue what a 'noodle' is... LOL

The only things that come to mind is your water circulation, pockets could make sense but not likely... and possibly plant intake slowed for some reason or another. Plants use what they need, maybe you upped another part of your dosing which effected the P uptake ?

Im reaching here because this dont make a lot of sense. When was the last time you dosed P04 ? Is there an off chance the test when screwy from a dirty vial ?

Im ata loss here Laith...


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post #3 of 12 (permalink) Old 10-23-2004, 12:39 PM
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In my experience ceramics and phosphates always come in pairs. I've used ceramic substrates and it leeched phosphates. Interestingly, phosphate removers are usually made of ceramic.

But I've never had problems with Eheim ceramic noodles leeching phosphate. Noodles are those rings...just look at a picture of ehfimech.
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post #4 of 12 (permalink) Old 10-23-2004, 05:20 PM Thread Starter
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Yes, the "noodles" are the Eheim ehfimech.

I just found one dead cardinal tetra that looks like its been dead for a day or two. Could a decaying dead fish increase PO4? I thought that would mainly increase N...

Still stumped...

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post #5 of 12 (permalink) Old 10-24-2004, 11:15 PM Thread Starter
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Well, haven't noticed any detrimental effects as yet from the high PO4!

I decided that this was an opportunity to test some of Tom Barr's theories on how high PO4 does not cause algae if other nutrients are present. So I've done a 50% water change and added more NO3.

So far, so good!

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post #6 of 12 (permalink) Old 10-24-2004, 11:22 PM
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Quote:
Originally Posted by Laith
Well, haven't noticed any detrimental effects as yet from the high PO4!

I decided that this was an opportunity to test some of Tom Barr's theories on how high PO4 does not cause algae if other nutrients are present. So I've done a 50% water change and added more NO3.

So far, so good!
When my PO4 levels where through the roof once, >/=2.5ppm, I just left it alone for 2 weeks. Didn't dose nitrates or cut the lighting, no CO2. Absolutely no algae grew. Doesn't make any sense, but I'm fine with it!
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post #7 of 12 (permalink) Old 10-25-2004, 12:57 AM
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I just had a problem with dosing KNO3 in my aquarium. I dosed it to 5ppm and measured and it was so low that it barely registered. Dosed a couple more times during the day but NO3 levels did not change. The fish started acting stressed so I did a water change. Just for the fun of it I checked the levels later that night and they registered 10 ppm, about what I would expect it to be. I did not have any ref solution to check my seachem kit. Are you using a seachem test kit by chance?? I think this might be the problem.
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post #8 of 12 (permalink) Old 10-25-2004, 07:01 AM Thread Starter
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No, using a JBL test kit and, as mentioned, I tested it against a known sample that I made up. So the test kit is measuring ok.

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post #9 of 12 (permalink) Old 10-25-2004, 09:35 AM Thread Starter
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Just found this thread where its mentioned that one may need to run carbon in the filter for a couple of days to get rid of factory residue?

Could this be the source of the sudden high PO4?

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post #10 of 12 (permalink) Old 10-25-2004, 09:37 AM
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Yes, carbon normally when used up can leech phosphates. Don't know about the factory residue part.
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post #11 of 12 (permalink) Old 10-29-2004, 11:39 PM
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Quote:
Originally Posted by Laith
Yes, the "noodles" are the Eheim ehfimech.

I just found one dead cardinal tetra that looks like its been dead for a day or two. Could a decaying dead fish increase PO4? I thought that would mainly increase N...

Still stumped...
Laith,

Decomposing fish will release both N and P; however, I wouldn't think that a single dead cardinal tetra would have much effect on a well-planted tank. My plants would suck up the released nutrients with barely a change in water quality. What size is your tank and how fast are your plants growing?

29 gal planted tank, 30" FW Aqualights w/ 1x 65W 6700K CF & 1x 55W 9325K CF, 20-lb CO2 w/ Milwaukee SMS122 controller, reverse-flow UGF (bah!), gravel substrate (also bah!), 4 Praecox, 3 Ottocats, 1 SAE, 1 Bristlenose cat, 2-3 C. japonica, 5 Red Cherry Shrimp, & too many detestable pond snails!!!
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post #12 of 12 (permalink) Old 10-31-2004, 08:44 AM Thread Starter
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It's a 200l tank (about 53G). Heavily planted with plants growing very well... pruning once a week...

I'm suspecting more and more the ceramic "noodles" in the filter. I'm going to take some and put in RO water and then measure several hours later and see what the PO4 reading is like.

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