NITRATE!

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Won't that shock my fish as they have had high nitrate for a couple months now I don't want to kill them so introducing the RO gradually. So far the is about 75 litres of RO today I will be doing a change and adding another 25 litres

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I just checked the north hampton water quality report on line, published by the Aqueon Co, the average nitrate reading for last year was 1.43ppm. The highest allowable nitrate level in drinking water is 10ppm, if they had 10 or over, there would be a media blitz tell everyone to stop drinking water. The EPA would shut them down, and fine them serious money.
Water companies are required to produce water for drinking, lives are on the line.
I would suggest that you make sure your API tests are not expired, or somehow contaminated.
You should check to see that your glassware is clean
Have a pet store in your area check your water.
I worked for a water company, and aquarists would call saying the water was bad, when we checked on our equipment, they were always wrong.
Any vial used to test for nitrate should be rinsed 3 times with DI water after each use,
you should have a known standard to check your test (we used 2ppm reagent standards), and each test should be run with 3 aliquots. This is how we tested at the water plant, and each chemist tested every shift using a spectrophotometer, that cost more than my truck.
Each chemist had to prove proficiency at each test yearly, this is standard at all US water producers.
 
Definitely you need to bigger 40-50% water changes with nothing but RO if you want to get this under control
 
I just checked the north hampton water quality report on line, published by the Aqueon Co, the average nitrate reading for last year was 1.43ppm. The highest allowable nitrate level in drinking water is 10ppm, if they had 10 or over, there would be a media blitz tell everyone to stop drinking water. The EPA would shut them down, and fine them serious money.
Water companies are required to produce water for drinking, lives are on the line.
I would suggest that you make sure your API tests are not expired, or somehow contaminated.
You should check to see that your glassware is clean
Have a pet store in your area check your water.
I worked for a water company, and aquarists would call saying the water was bad, when we checked on our equipment, they were always wrong.
Any vial used to test for nitrate should be rinsed 3 times with DI water after each use,
you should have a known standard to check your test (we used 2ppm reagent standards), and each test should be run with 3 aliquots. This is how we tested at the water plant, and each chemist tested every shift using a spectrophotometer, that cost more than my truck.
Each chemist had to prove proficiency at each test yearly, this is standard at all US water producers.

Since he is talking liters not gallons make me think he is on the other side of the pond...
 
England and most of Europe have adopted the same water quality standards as the US.
10 ppm and higher nitrate can cause methemoglobinemia, or blue baby syndrome. It can kill children under 2 yrs of age, the only place you find 10ppm nitrate or higher is on wells near feed lots in rural areas. In cities, the health dept would have the water turned off.
 
I just checked the north hampton Eng water quality report, they have even lower nitrates, 0.55ppm.
England and most of Europe have adopted the same water quality standards as the US.
10 ppm and higher nitrate can cause methemoglobinemia, or blue baby syndrome. It can kill children under 2 yrs of age, the only place you find 10ppm nitrate or higher is on wells near feed lots in rural areas. In cities, the health dept would have the water turned off.
 
I would deff do a 50 to 75% WC i let my Nitrates get to 40 to 60ppm then i do a 40 to 75% WC change more water if higher Nitrates or less if their still lower... i do a water chnage every Friday after work if im not home my wife does it every week no exception if theirs 1 way to control Nitrates its a good old fashion WC...
 
Try plants. I have a 20 gallon long aquarium that has a bunch of bushy elephant ear plants. They give it a really cool jungle look for the fancy guppies I have growing in it. My stock list includes (across three interconnected aquariums) a 10 inch pleco, a 5 inch Rio Grande cichlid, a 5 inch oscar, 5 inch blood parrot cichlid, 5x 3-4 inch convict cichlids, 4 inch bluegill sunfish, 4 inch longear sunfish, 2x 3 inch danios, 2x 1 inch cory cats, 3 inch chinese algae eater, a small school of minnows, half a dozen large rams horn apple snails, a small army of glass shrimp, a leopard frog and probably a bunch of other things I don't know about hiding in the dark places. I usually keep around 100-110 gallons in circulation and my nitrate PPM is almost 0. It is so low right now algae barely grows.
 
I would try to verify your test kit against another one. I have contacted API before and they verified that if you use your nitrate test without properly shaking the bottles long enough to mix the reactants giving you a falsely low reading then once you do start shaking the bottles enough then the ratios of the reactants will be wrong which will now give false high readings.
 
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