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Old 04-27-2015, 07:42 PM   #11
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Salt can help prevent nitrite poisoning.

I've tried 2 different tests.


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Old 04-27-2015, 07:53 PM   #12
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If you're still seeing 5ppm nitrite after a large water change then you have to have a huge concentration of nitrites in the water. Honestly, if I was at your point I would be doing 50% water changes back to back until the nitrites go down.

For your nitrites to get back to 5ppm immediately after a 90% water change they had to be in the realm of 50ppm.

Cut feeding to once every 3 days.

Do 50% water changes every other hour until the nitrites are down.

This will get the nitrites down to manageable levels.

Lastly, you can test the actual volume of nitrites by doing this:

Take out 1 cup of tank water and mix thoroughly in each container.
Container 1 - 1 cup of tank water
Container 2 - 1/2 cup of container 1 & 1/2 cup of container 2
Container 3 - 1/2 cup of container 2 and 1/2 cup of tap water
Container 4 - 1/2 cup of container 3 and 1/2 cup of tap water
Container 5 - etc, etc, etc


Test nitrites down the line and you will eventually get to a legible reading on your nitrite test.

If you get a reading of say, 3ppm nitrite out of a given container then you can calculate the nitrite level of the tank since you will be halving the nitrite concentration in each dillution.

Container 1 - 3ppm
Container 2 - 6ppm
Container 3 - 12ppm
Container 4 - 24ppm
Container 5 - 48ppm
Container 6 - etc.

Following that, you will see how many 50% water changes will be required to get the nitrite level down to where you want it.
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Old 04-27-2015, 08:56 PM   #13
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It's not immediately after. Right after its down to .25. But the next day, right back up to bright purple.


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Hi! I'm new here, but I've got the fish bug, and I've got it bad.

20 g Community
55g build happening now, plan: African Cichlid tank
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Old 04-27-2015, 08:58 PM   #14
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Quote:
Originally Posted by Mebbid View Post
If you're still seeing 5ppm nitrite after a large water change then you have to have a huge concentration of nitrites in the water. Honestly, if I was at your point I would be doing 50% water changes back to back until the nitrites go down.

For your nitrites to get back to 5ppm immediately after a 90% water change they had to be in the realm of 50ppm.

Cut feeding to once every 3 days.

Do 50% water changes every other hour until the nitrites are down.

This will get the nitrites down to manageable levels.

Lastly, you can test the actual volume of nitrites by doing this:

Take out 1 cup of tank water and mix thoroughly in each container.
Container 1 - 1 cup of tank water
Container 2 - 1/2 cup of container 1 & 1/2 cup of container 2
Container 3 - 1/2 cup of container 2 and 1/2 cup of tap water
Container 4 - 1/2 cup of container 3 and 1/2 cup of tap water
Container 5 - etc, etc, etc


Test nitrites down the line and you will eventually get to a legible reading on your nitrite test.

If you get a reading of say, 3ppm nitrite out of a given container then you can calculate the nitrite level of the tank since you will be halving the nitrite concentration in each dillution.

Container 1 - 3ppm
Container 2 - 6ppm
Container 3 - 12ppm
Container 4 - 24ppm
Container 5 - 48ppm
Container 6 - etc.

Following that, you will see how many 50% water changes will be required to get the nitrite level down to where you want it.

Wow! Thanks for all the great info!


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Old 04-30-2015, 09:39 AM   #15
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Nitrites still high. Doing all the water changes needed to keep them down for fish, but the next day, they're always right back up there again, 5ppm.

Are all these water changes stalling my cycle?


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Old 04-30-2015, 09:49 AM   #16
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Originally Posted by JengoJengo View Post
Nitrites still high. Doing all the water changes needed to keep them down for fish, but the next day, they're always right back up there again, 5ppm.

Are all these water changes stalling my cycle?


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Did you do the test i recommended to see your nitrite concentration?
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Old 04-30-2015, 12:19 PM   #17
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Originally Posted by Mebbid View Post
Did you do the test i recommended to see your nitrite concentration?
Yes.

Test 1, 100% tank water- 5ppm, bright purple
Test 2, 50% tank water- 2-5 ppm, still bright, but not as bright.
Test 3, 25% tank water- .25-.5 ppm, light blue to light purple

What do you advise?

This is after doing a 75% water change 24 hours previously.
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Old 04-30-2015, 12:22 PM   #18
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Yes.

Test 1, 100% tank water- 5ppm, bright purple
Test 2, 50% tank water- 2-5 ppm, still bright, but not as bright.
Test 3, 25% tank water- .25-.5 ppm, light blue to light purple

What do you advise?

This is after doing a 75% water change 24 hours previously.
Sounds like another 3 water changes should be done in the near future.
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Old 04-30-2015, 12:25 PM   #19
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Sounds like another 3 water changes should be done in the near future.

OK, could you elaborate? 3 water changes of what %?

Also, could all the water changes be slowing my cycle?
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Old 04-30-2015, 12:25 PM   #20
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Quote:
Originally Posted by JengoJengo View Post
Nitrites still high. Doing all the water changes needed to keep them down for fish, but the next day, they're always right back up there again, 5ppm.

Are all these water changes stalling my cycle?


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I don't think its stalling your cycle. I told you when you started its harder to cycle with this many fish. What I think your seeing is high amounts of ammonia being converted to nitrites while they're just not getting turned to nitrates fast enough causing you a bottle neck of nitrites. Just keep up the water changes, keep up the prime and wait on those nitrates to start raising faster ridding your trites. I also suspect a little bit of over feeding.

You will get it, best of luck.
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