Kat_Rigel Posted November 1, 2020 Share Posted November 1, 2020 I'm having some issues with the accuracy of my water testing kits and was hoping the NERMs here can help me out. Initially I thought I had "old tank syndrome," since this tank has been running for approximately 3 years. It is very heavily planted and I have stopped adding liquid fertilizer the past 3 weeks to try and get this nitrate issue under control. My nitrites and ammonia are zero, but nitrates are showing between 80ppm and 160ppm according to the API master test kit (widely regarded in the hobby as the most reliable/accurate.) I have been playing with the Tetra test strips as well, and it shows the nitrate at 40ppm. Its still higher than I'd like, but shows that my efforts at correcting the issue might be working. I did a 30% water change last week but nitrates stayed steady. I did a 40% water change today and the API test kit still shows no change in nitrate levels. I would expect to see SOME improvement, as I have also been making a concerted effort to feed less and also cleaner foods (holding off on Repashy, for example.) I've tested my other tanks too, including ones that have not been running for too long (around 3-4 months, set up with a mature sponge filter and about 50% water from a mature tank) and I'm also getting very high nitrate readings, 40 to 80ppm. That doesn't seem realistic. Possible yes, but unlikely. I have checked the expiration dates and everything is well within working range. My tank is probably overstocked, so I am not completely innocent in all this, but I am very confused that I'm getting such different results. What do you guys use that you feel is the most accurate? I hate that all these tests are color based, I'd much rather get a reading from something like a pH meter. (*Insert science background rant here.*) Obviously I'll need to adjust stocking levels, but I need a way to monitor if I'm making progress! Link to comment Share on other sites More sharing options...
Buzz Posted November 1, 2020 Share Posted November 1, 2020 Since you are using the API nitrate test, solution bottle 2 needs to be shaken vigorously for about 30sec. If this is not done you can get unreliable results. Have you been doing this? If not, I would try this and retest. Link to comment Share on other sites More sharing options...
Bill Posted November 1, 2020 Share Posted November 1, 2020 Did you test your tap water? Ben Ochart did a YouTube video on this. His tap water parameters changed, and had a higher than before nitrate level out of the tap. Link to comment Share on other sites More sharing options...
Kat_Rigel Posted November 1, 2020 Author Share Posted November 1, 2020 (edited) Yes, I have been following the written directions to a tee. I shake both bottles for 1 minute before testing, and I also shake for 1 minute after adding both reagents (per directions.) I have not tested my tap in the past 3 weeks so I will test that and post results here. Edited November 1, 2020 by Kat_Rigel Link to comment Share on other sites More sharing options...
Bill Posted November 1, 2020 Share Posted November 1, 2020 Also, I have had API test solutions that seemed slightly off. I compared to the tap water and determined some readings were registering high, for example, ammonia that was really zero showed as 0.25. This also happened with an API phosphate test. Link to comment Share on other sites More sharing options...
Kat_Rigel Posted November 1, 2020 Author Share Posted November 1, 2020 25 minutes ago, Bill said: Also, I have had API test solutions that seemed slightly off. I compared to the tap water and determined some readings were registering high, for example, ammonia that was really zero showed as 0.25. This also happened with an API phosphate test. 🤔 Hm, interesting. Well, I tested my tap and it is showing between 20 and 40ppm nitrate, which explains a lot. I am going to pick up a new API liquid nitrate test to compare; either the test is wonky (as you refer to above,) or I should switch my water source for a little while until my tap water becomes more normal. Sometimes it's the simple stuff; every time O think I'm getting the hang of fishkeeping, I ignore some small thing because it seems too simple. 😅 Good thing my fellow NERMs can help me out! Link to comment Share on other sites More sharing options...
Kat_Rigel Posted November 1, 2020 Author Share Posted November 1, 2020 Ah! And I just remembered that I had a gallon of RO water under the sink. I tested it and it showed 5ppm nitrate. Time for a new test kit! 1 Link to comment Share on other sites More sharing options...
L.W. Wetarm Posted November 10, 2020 Share Posted November 10, 2020 I use two other nitrate test kits in addition to the API test tube kit. I won’t mention any brand names for my comparison, other than the subject brand. I did all three at the same time. Followed the directions to the letter. API read a very solid orange indicating 40ppm. Brand X read a faint pink somewhere in between 10 &25 ppm. Brand Z read bright yellow indicating no nitrates...or less than 10 ppm. Who to believe? I continue using the API test despite the fact that I think it’s reading high. It’s the test that I’ve used since day one so I can gage the ups and downs. I think of it like a speedometer that reads 20 mph too high. So as long as you know how far off you are you can drive 45 mph though the school zone and give a friendly wave to the cop with the radar. 1 Link to comment Share on other sites More sharing options...
GardenStateGoldfish Posted November 11, 2020 Share Posted November 11, 2020 On 11/1/2020 at 1:55 PM, Kat_Rigel said: My nitrites and ammonia are zero, but nitrates are showing between 80ppm and 160ppm according to the API master test kit (widely regarded in the hobby as the most reliable/accurate.) The API liquid test kit for Nitrate is notoriously unreliable, you really have to shake it and bang it to do it just right, I personally really prefer the tetra 6 in 1 strips and found them to be very accurate. The API liquid test kit is the gold standard, but the ammonia test is very commonly misunderstood and the nitrate test is very easy to mess up due to it needing to be vigorously shaken for 60 seconds before adding the drops to the vial. Can't wait for Cory's test strips! Link to comment Share on other sites More sharing options...
Kat_Rigel Posted November 11, 2020 Author Share Posted November 11, 2020 1 hour ago, GardenStateGoldfish said: Can't wait for Cory's test strips! Couldn't agree more! 1 Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now