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Old 01-17-2018, 08:59 PM   #1
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high nitrites and nitrates

ok so in our fry tank of bnps we have had high no2 and no3 for a long time and not really going down we set the tank up christmas day as our bnps started mating and needed them out main tank so it had no time to cycle but we used the tank water from main tank to fill it up with as all tests in that water were perfect and 24 hours later roughly there was eggs all have hatched 2 weeks ago now and had been doing daily water changes using main tank water however that wasnt getting the nitrites and nitrates down so we started using tap water with dechlorinator every other day for over a week now but they still not going down we have got an inbuilt filter going and another internal filter an air stone a bit of bog wood a plant and a rock in there ...luckily none of them have died yet from the high levels (one got caught in filter outtake earlier my fault ooops) ... there is no gravel etc in there just a bare bottom tank ...how can we get them down as we testing daily doing water changes every other day
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Old 01-17-2018, 09:02 PM   #2
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just to add aswell all other tests in fry tank are fine and main tank are all normal
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Old 01-18-2018, 02:22 AM   #3
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Tested for ammonia?
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Old 01-18-2018, 06:20 AM   #4
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Tested for ammonia?
yep like i say all other tests are fine
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Old 01-18-2018, 06:32 AM   #5
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The % of water changed is the % the nitrite and nitrate will be reduced..
So with nitrite showing IMO anything less then 75% is not really helpful..
You may need to do 2 @75% if the nitrite is high...
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Old 01-18-2018, 06:46 AM   #6
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The % of water changed is the % the nitrite and nitrate will be reduced..
So with nitrite showing IMO anything less then 75% is not really helpful..
You may need to do 2 @75% if the nitrite is high...
ok my partner was told on a site on facebook that us doing 50% water changes daily was a bit much and to only do 25% every other day ...with the 75% how long to leave it between each?
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Old 01-18-2018, 06:48 AM   #7
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it was in the danger zone its now in the caution zone so dont want it to go back in danger zone but want it out caution zone too
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Old 01-18-2018, 07:02 AM   #8
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Done properly [match temp and ph as close as possible] both 75% changes can be done in one day.
With levels being high you might be best to do 75% today and then again the next day..
I do large water changes even when my fry are still wigglers. The most important part is to match the tank. This is easily done by not adjusting your source water and using a thermometer to check temp. Within 3-5 degrees should be fine. Not messing with source water is more important when you do large water changes as matching is pretty important IMO..
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Old 01-18-2018, 07:22 AM   #9
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Done properly [match temp and ph as close as possible] both 75% changes can be done in one day.
With levels being high you might be best to do 75% today and then again the next day..
I do large water changes even when my fry are still wigglers. The most important part is to match the tank. This is easily done by not adjusting your source water and using a thermometer to check temp. Within 3-5 degrees should be fine. Not messing with source water is more important when you do large water changes as matching is pretty important IMO..
would we be able to use main tank water as that is perfect tests wise and temp is the same as fry tank or best with tap water ...my partner does all the water changes but he works so they would prob be today (which is water change day anyway) and tomorrow as he gets home late from work
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Old 01-18-2018, 07:34 AM   #10
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Used tank water will already have nitrates in it..
Not the best plan and possibly why you are having issues with water..
Very little good bacteria live in the water column . They colonize surfaces not the water..
IMO old tank water is garbage and exactly what you want to get out of tank..
Possibly doing large change on big tank with plenty of new water will dilute the nutrients enough to make that water better then what the fry are in but I would try if you feel comfortable to give fry new water..They will need this throught your raising them..
I breed and raise a lot of fish ,but I change more water..Can't do the one without the other..Poor water quality is 90% of why fry fail often.


I'll add using a conditioner like Prime can detoxify the nitrite for 48 hours. Follow the directions and know the nitrite will still show on test and is only detoxified for 48 hours.
If in 48 hours the filter does not process the nitrite into nitrate you will need to dose again ,which should be done with a water change..
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