0 phosphate on my test? Why was that?

Discussion in 'Reef Aquarium Discussion' started by Ocean Lotion, Feb 12, 2018.

  1. Ocean Lotion

    Ocean Lotion Active Member

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    I did my water tests today and for the first time ever I got 0 for phosphate. I use the Hanna checker ul phosphorus tester and feel pretty confident in it. Of course I did not look at the results of the first test because the 2 mins had passed and the display had shut off. If I do not set the alarm on my phone I miss the results frequently. ADD at work. Any way, I asked myself, self, why did I get 0? Less feeding? Nope. Just changed gfo? Nope again. I had been praying to the poceleon goddess do to a nasty flu. Did not leave my upstairs for 24 hours so never even looked at my tank and I had not shut my UFO light off the day before so my tank went 3 days with the fuge light on 24/7. I usually shut it off for 8 hours a day. I also noted definatele chaeto growth since the last time I peered into my sump. I am going to have to do an experiment. 3 days of shutting my fuge off for 8 hours a day and then test. Then go 3 days of 24/7 lighting and then test and do this a couple times along with measured feedings. Need to order more test reagents first. Anyone else notice a similar correlation? 20180212_212330.jpg
     
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  2. hybridazn

    hybridazn Acro killer..... Staff Member Team R2R R2R Supporter 3RMAS Member R2R Excellence Award Photo of the Month Award Showcase Editor Build Thread Contributor Partner Member 2018

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    Yea your phosphates are just being absorbed quickly, this is evidence by your cheato growth. If everything in the tank seems fine I wouldn't worry too much about it. You could also try bumping it up a bit by extra feedings if you are worried about it.
     
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  3. Ocean Lotion

    Ocean Lotion Active Member

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    That is how it appears. So a reefer could possibly control the po4 in their tank by fuge light schedule. Portland is getting a little high, leave fuge light on longer. I did not think po4 could be controler by light time. Just another tool.
     
  4. Randy Holmes-Farley

    Randy Holmes-Farley Reef Chemist Staff Member Team R2R R2R Supporter R2R Excellence Award Article Contributor Expert Contributor

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    That may happen, certainly. It can also be controlled by total flow past the algae.

    How much higher was phosphate before the 24/7 lighting?

    I personally never noticed a difference between 24/7 lighting and reverse cycle lighting on my tank inhabitants (wasn't measuring phosphate), so I went with less hours since it was cheaper. :)
     
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  5. Ocean Lotion

    Ocean Lotion Active Member

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    I had checked it 3 weeks earlier and it was .066. Always runs between .03 and .06. Had not changed any gfo or h2o changes. I know 1 measure is not a trend or good test. Was interesting though and I will have to try and prove it out.
     
  6. Randy Holmes-Farley

    Randy Holmes-Farley Reef Chemist Staff Member Team R2R R2R Supporter R2R Excellence Award Article Contributor Expert Contributor

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    OK, let us know what you find. :)
     
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