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Old 07-28-2008, 06:34 PM   #11
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NO2 has virtually no effect on fish and there is always trace amounts of NO2 if using higher end testing equipment. My first advice is to set up a quarantine tank and quarantine all incoming purchases for at least a month. Secondly, I take it you treated Paraguard within the main system? If you are treating for a parasite, regardless of the medication, you do it in a separate container. As long as the water is thoroughly mixed it can be used in a couple hours for emergency situations, but aging 24hrs is best. Hyposalinity should be performed in a quarantine tank. Here is a starter article for you: An Ounce of Prevention is Worth a Pound of Cure: A Quarantine Tank for Everything by Steven Pro - Reefkeeping.com
I did a few quick searches on Google and came back with tons of hits about NitrIte being toxic to fish even at levels of 0.5. Granted nitrIte is not as deadly as ammonia but it is toxic and usually indicates an incomplete cycle.

I agree with your suggestion of QT. Allowing the tank to go fishless will most likely get rid of the ich issue but the fact that the tank isn't fully cycled is a larger problem and probably the cause of the ich in the first place. Stress and all....

When ammonia and/or nitrite levels in an aquarium become too high, such as during the period when biological filtration is being established, fish become sick and frequently die. Ammonia toxicity and nitrite toxicity are the result of complex interactions between these chemicals, other water quality parameters and the fish.

Ammonia toxicity and nitrite toxicity are two of the leading causes of fish death in aquarium systems. At higher levels, effects are immediate and numerous deaths can occur rapidly. However, lower levels, over a long period of time, can still result in increased incidence of disease and more chronic losses. Other water quality parameters – including pH (a measure of the amount of acid in water), temperature and dissolved oxygen – determine the degree of toxicity.
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Old 07-28-2008, 06:37 PM   #12
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As for your LR increasing the amount you have would benefit your tank. General rule is 1.5-2lbs per gallon of water for good biological filtration. Having a sump with more LR helps as well. I know with limited space it is difficult to add things like a sump.
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Old 07-28-2008, 07:53 PM   #13
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Ziggy: The levels of NO2 you are posting refers to fw fish and depending on the species can range, in regards to NO2 poisoning, from .10-200mg/l and depending on prolonged exposure. In general, for fw fish, values should read below .10mg/l through basic test kits. Sw on the other hand, 90mg/l+ would be required and once again depending on species and exposure timeframes. Most aquariums are going to have sufficient bacteria to convert NO2; however, it would take quite a bit to impact greatly. At .05 this simply is not the case.

Melosu: See above regarding NO2. Either the quote you gave was for fw or implied for such or just plain incorrect.

Here is a basic article on it: Nitrite and the Reef Aquarium by Randy Holmes-Farley - Reefkeeping.com

You can also check Noga and Untergasser as they also reference past works stating the same.
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Old 07-28-2008, 08:39 PM   #14
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Just some more reading on nitrites

The natural reef
http://www.athiel.com/lib5/natreef.htm
It says " Nitrites are as toxic as ammonia themselves."
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Old 07-29-2008, 01:16 AM   #15
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Great article Innovator. Thanks for the link!
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Old 07-29-2008, 07:47 AM   #16
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Well as I said...the more reading I do the more references I find to NitrIte being toxic to both FW and SW fish. My point was simply that it was an indicator of other issues such as an incomplete cycle. Even the article you referenced and linked says that NitrIte is toxic to marine fish. Regardless of the levels prolonged exposure to NitrIte can and will cause issues.

Back to the topic at hand.

I think the best suggestions have been to remove your fish from the display QT them and treat them for ich allow your tank to go fishless while treating for ich (QT system) so the ich can run it's life cycle and hopefully die out. I would also increase the amount of LR you have in your system.
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