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Old 07-05-2015, 11:41 PM   #1
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High trates

I recently set up a 75 but filled it about 50% with water from my old 75 and my nitrates have been up in the 80 range for about a week and a half. I've changed 40 gallons in a week and they still have not came down. My test is not old and reads zero when I test fresh saltwater. I have 2 clowns, 1 mccoskers wrasse (did have 2 but one pasted away during the move), a coral beauty, and a clown tang until I find a bigger home for him. I have a sump which is about 15 more gallons. I run a protein skimmer good for 225 gallons. Any help would be great.
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Old 07-06-2015, 01:58 AM   #2
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Nitrates that came over from the old tank and possibly stirred up even more if the sandbed was disturbed.
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Old 07-06-2015, 11:35 AM   #3
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Water doesn't hold enough bacteria in it to remove the ammonia, nitrites or nitrates from the water. If the tank is new, and you just added water, your in for the long haul.
Hopefully you moved the live rock over to the new tank, and rinsed out the sand bed before moving it.
In order to get the Nitrates down, figure you'll have to do 50% water changes a few days in a row, not once a week. 3-4 days in a row should bring them down to a nice level.
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Old 07-06-2015, 08:43 PM   #4
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Tank is around 2 months old and I used half of the water that was from my old tank. I never had trates over 20 in the old tank. I've changed 40 gallons since Friday. I really have no way to do a 50% ware change I can only mix 20 gallons at a time.
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Old 07-06-2015, 09:47 PM   #5
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Thats the only way your going to knock em down fast, is with large water changes.
You'll need to do quite a few in a row with that small of WC.
Or you start running Denitrator, Vodka dose, run a fuge, run an ATS. Your pick.
As stated, the water doesn't have enough bacteria in it to cycle a tank, your old water will not keep your current tank from cycling. Only using the same amount of Cured Live Rock will prevent a tank from cycling.
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Old 07-07-2015, 08:06 AM   #6
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But what I don't get is I have no ammonia but high trates. If my tank was going through a cycle wouldn't I have ammonia present?
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Old 07-07-2015, 08:08 AM   #7
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Throw a big bag of chemipure elite in there...can't promise it will do anything but might help between water changes.


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Old 07-07-2015, 09:17 AM   #8
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The nitrates are coming from somewhere. The lack of ammonia or nitrites is good, it means your tank has a bacteria colony large enough to process what is being produced! That is the nitrate cycle that you build up when you cycle a tank.
So, the key here is to identify where the nitrates are coming from. Lots of food is a prime source for this, as it will decomp and go through the nitrate cycle. So, with large water changes to bring down the nitrate levels you can cut back some on feeding.
When it comes to lowering the levels you already have, say your nitrates are at 40 right now. A 50% water change will lower the nitrates to 20. So then another large water change will be needed to bring it down to 10, and so on.
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Old 07-07-2015, 12:12 PM   #9
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Masoniac, You never answered one of the MOST important questions.
Did you transfer the live rock from the other tank to the new one?
Did you transfer the sand from the other tank to the new one?


If you transferred the sand, did you rinse it in tank water until it wasn't nasty?
If you rinsed it in fresh water, you killed the BB and initiated a cycle.
If you didn't rinse the sand and just moved it from one tank to the other, well that's most likely your problem right there.
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Old 07-07-2015, 12:20 PM   #10
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but everyone is correct, the only way to quickly lower nitrate is with big water changes.
all the methodologies for controlling nitrates like reefing madness mentioned takes about 3-6 months to get going in full swing and making a real difference.
The anerobic bacteria that handle the de-nitrification process take at least 12 weeks to get established in a new tank, and getting them to populations that keep nitrates down to zero can take another 3-6 months.


That's why all the fixes for nitrate and algae are slow, methodical process's, it takes that long for the bacteria that "eat" nitrate to really kick it into high gear.
Even running bio-pellets takes on average 2-3 months before you see real benefit.
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