High Phosphate & nitrate - The Planted Tank Forum
 
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post #1 of 8 (permalink) Old 11-01-2004, 07:55 PM Thread Starter
 
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Post High Phosphate & nitrate

Finally bought NO3 & PO4 test kits. Tested last night and surprise, surprise, PO4 = 5 , NO3 = between 50 and 110. No wonder I had algae.
Did a 30% water change with RO & DI ( 3 GAL RO + 2 GAL DI )
Retested after an hour, PO4 still at 5, NO3 down to 5.
This morning,
PH 7.6
KH 3.36dH
GH 4.48gH
NO3 5
PO4 5
I also removed my carbon from my filter as I read in one of the treads that over time it will increase PO4 (Mine was a little over a month old )
Any other suggestion as to what can be done to bring down PO4 other than water changes. If not how often can I change the water without affecting the biological balance.
20 gal tank, low light, 12 plants, 19 fish.
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post #2 of 8 (permalink) Old 11-01-2004, 08:12 PM
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Does you tap water contain PO4 and NO3? Why do you use RO/DI?

At least one of your NO3 reading is not right, you can not bring down NO3 from 50-110 to 5 by doing one 30% wc, the math just does not add up.

Do water change as often as required to keep water parameter in check.


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40w T6 ODNO4x, no CO2. Discus grow out.
10gallon Tonina tank, 2x15w T6 ODNO 4x
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post #3 of 8 (permalink) Old 11-01-2004, 08:36 PM Thread Starter
 
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Tap( well) water is loaded with iron. More than 1 mg/l after just a few seconds.
RO comes in at NO3 = 5, PO4 = 0. Also tested the water at a friend's place today ( city water) NO3 = 5, PO4 = 5. This was the water originaly used to set up the tank about 2.5 months ago.
I thought about that NO3 result also. It's possible that I may have miscounted the drops last night.
Thanks for the reply
Andy
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post #4 of 8 (permalink) Old 11-02-2004, 01:13 AM
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You have a bad nitrate test kit.
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post #5 of 8 (permalink) Old 11-02-2004, 01:42 AM
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that's my guess too. Tell us what kit you have and how you use it. Many people have trouble getting correct NO3 reading from test kits, usually on the low side.


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10gallon Tonina tank, 2x15w T6 ODNO 4x
---------------------
I will do aquascapes after I collect all the plant species and grow them to perfection.
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post #6 of 8 (permalink) Old 11-02-2004, 02:38 AM Thread Starter
 
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high phosphate & nitrate

Thanks for the replies.
The kit is a Nutrafin A-7845
Testing as per the instructions; 5 drops of reagent #1, 5 drops of # 2, Shake then add 3 drops of # 3 after shaking the bottle for at least 15-20 seconds.
( They say 5 sec. which I did last night. Maybe this one was'nt shaken enough, especially if it had been sitting around for a while.) Shake & waited 5 min, then did the color reading.
I think i'll take a water sample to the lfs tomorrow and see what they get.
Andy
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post #7 of 8 (permalink) Old 11-02-2004, 02:54 PM
 
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ahh, yes, nutrafin test kits are junk. I have that same test kit, and its goin to waste.
R/O water should be 0ppm nitrate, and if it's run thru a DI filter, 0ppm phosphate.

the aquarium pharmaceutical NO3 test kit is more accurate.
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post #8 of 8 (permalink) Old 11-02-2004, 06:37 PM Thread Starter
 
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I'll have to see if I can find those around here. So far, 3 different lfs and they all carry only the nutrafin kits
Had the water tested at the lfs, they got 20ppm nitrate and well above 5ppm phosphate. I picked up a phosphate sponge and along with water change I'll hopefully get this under control.
Andy
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