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02-22-2006, 01:17 AM
Different test kits measure things differently. Not all kits are created equally, some measure free X in the water column others claim they can detect X in a bound form.
Here is a quick example of what I mean, this weejend I took these samples from the same area of the sump within a 5 minute period of time and 4 different NO3 test kits;
Aquarium Pharm. #1 (1 yr old) - 0ppm NO3
Aquarium Pharm. #2 (brand new) - 10ppm NO3
Sea-Chem Kit (a couple months old) - 20ppm NO3
Salifert Kit (few month old) - 40ppm NO3
So which to believe is the most accurate??? I chose the salifert kit since it had been a couple weeks since my last waterchange and it is normal for our heavily stocked tank that is fed very regularly.
The cheaper Aquar. Pharm kits are okay for cycling your tank, as ammo and nitrite tests seem to run more in line with each other, the sea-chem kits are okay, but it's my opinion the Salifert kits are the most accurate (though the more expensive).
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