High P04 in a new cycled tank?

Discussion in 'General Aquatic Talk' started by neilh, Nov 4, 2009.

  1. neilh
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    neilh Algae harvester

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    I'm perplexed at the moment....

    Slagter might need temporary tank space for his Wild X's while their tank is being repaired/replaced. So yesterday I whipped out all the test kits to double check params

    pH 7.0
    Ammonia 0ppm
    Nitrite 0ppm
    Nitrate (API test) 0ppm
    Nitrate (Sera test) 10ppm
    P04 (Hagen/Nutrafin test) > 5 ppm :eek:

    Now the tank has been in a fishless cycle for close to a month. I only have some algae covered driftwood and bio-rock in the tank in addition to filter media(Ceramic rings, filter floss, Sera Pro Peat and 2 air driven sponges).

    Any ideas? Possibly from algal death? I also test my tap water to make 100% sure, result was 0ppm for P04. Time for a new test kit maybe?
     
  2. Laure
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    Laure Algae harvester

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    You may have noticed on the other forum my dissatisfaction with hobby grade test kits, due to the fact they show me one thing and the algae which you can use as a bio-indicator show me something different. Then I tried different brands and get different results. I've given up on test kits...

    So how did you cycle? With fish food? Might explain your PO4 readings. If Nitrate is around 0-10 (let us assume foolishly the kits are accurate), then the tank is likely not cycled yet, unless you have been doing plenty of water changes.
     
  3. neilh
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    neilh Algae harvester

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    Been using detritus from my Discus tank in combination with Stability and Organic Aqua B-bac.

    Water changes have been large at around 30% every week
     
  4. wearsbunnyslippers
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    wearsbunnyslippers Administrator Staff Member

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    if you add 1ml of lenolax to 10l of water you should get a 1.3ppm reading, you can use that to test your test kit...

    if there are nitrate readings, that would mean the tank is cycled :p nitrite or ammonia readings mean not cycled...
     
  5. neilh
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    neilh Algae harvester

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    Indeed, tank is cycled. Just the PO4 is baffling.

    Thanks for the idea Raymond, will give that a shot this afternoon
     
  6. R.C.
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    R.C. Moderator Staff Member

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    The API test kit, in particular the Nitrate test is known to read 10ppm below others. There was a comparison test done on one of the international forums I frequent and the SERA kit came out tops, but yeah in general, I share Laure's dissatisfaction with "hobby grade" test kits.
     
  7. neilh
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    neilh Algae harvester

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    Thanks RC, that was the exact reason for buying the Sera test. Seeing all the algae did not correlate with the results from the API test kit. Might be time to splurge on Salifert
     

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