ammonia reading after water change - The Planted Tank Forum
 
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post #1 of 9 (permalink) Old 02-02-2014, 08:36 PM Thread Starter
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ammonia reading after water change

Hey everyone,

I tested my water before water change this morning and I was at 0 for ammonia, nitrite and nitrate.

Changed approx. 15% of the water with tap water that laid in the container for 7days and treated with Prime.

This evening, i tested again the water and I get an ammonia reading of 0.25

How is that possible? Tested tap water and it is at 0.

I did not vaccuum or touched the filter. Only removed water.

Any idea?
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post #2 of 9 (permalink) Old 02-02-2014, 09:07 PM
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You using Aquasoil? If you are, maybe you disturb the soil while doing water change. It's just Ammonia spike. You might want to do small water change to reduce Ammonia.
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post #3 of 9 (permalink) Old 02-02-2014, 09:09 PM
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Did you add prime the day of addition? Prime will give false positive ammonia readings because it converts chloramines into ammonium, which is ammonia's harmless form that will be picked up by test kits.
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post #4 of 9 (permalink) Old 02-02-2014, 09:42 PM
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Did you add prime the day of addition? Prime will give false positive ammonia readings because it converts chloramines into ammonium, which is ammonia's harmless form that will be picked up by test kits.
Agreed. Prime will give you a false reading

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post #5 of 9 (permalink) Old 02-02-2014, 09:52 PM Thread Starter
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Yes i added prime to the new water just before (5 min) adding it to the tank.

How long before this possible false reading goes away? 24 hrs as this is the time of effect of Prime?
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post #6 of 9 (permalink) Old 02-02-2014, 09:59 PM
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Yes i added prime to the new water just before (5 min) adding it to the tank.

How long before this possible false reading goes away? 24 hrs as this is the time of effect of Prime?
Yeah I'd try tomorrow. I wouldn't test unless there's a problem. All that testing has ever done for me is made me worry about things lol

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post #7 of 9 (permalink) Old 02-02-2014, 11:10 PM Thread Starter
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I rarely test anymore mostly only on water change day.

BTW if i have ammonia, nitrite at 0 and nitrate under 10, do I still have to do water change or top off is sufficient?
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post #8 of 9 (permalink) Old 02-02-2014, 11:36 PM
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Always do a water change if in doubt about something. There is NO substitute for a good water change. There's organic compounds in the water that tests don't pick up. These are the same compounds that build up and cause things like certain types algae and diseases in fish due to poor water quality. And if you're dosing EI and running a high tech setup, the importance of a water change goes up significantly. Topping off water that has evaporated does nothing to remove dissolved solids and organics from the water. They just keep building up when you top off the water. Of course if it's a very low tech setup than water changes can be done less frequently, but still need to be done after a while

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post #9 of 9 (permalink) Old 02-02-2014, 11:49 PM Thread Starter
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This is a low tech setup... no co2, no excel, only flourish tabs once every 6 weeks. Heavily planted also. I'll still do 10-15% water change weekly.

Thanks all for your help.
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