More Fish, More Nitrite!
Hi Scott, or Bob.
<Scott F. here for you!>
How are you guys doing, hope you're doing wonderful.
<Yes, I am! Thanks!>
I wrote you a few days ago, and asked you for a few pointers on my clown trigger, and my lion fish. Well, even my tank is 120 gal, I pictured that, in a few years from now, it will be like me and my wife living in the kitchen for the rest of our lives
<Very good analogy...And, as rooms go- definitely my first choice to be stuck in!>
(so we decided to get a 75 gal for the lion fish only with some live rock and put that aquarium in our office.
<Good idea...you and the fish will appreciate the space, believe me>
But now the problem is that we fell in love with a puffer 4" (Arothron manilensis), and we bought it. Now we have 3 fishes that are doing well in the 120gal tank, but just for about 3 months till the other tank gets fully cycled and put the lion in the other one.
<Okay>
Now my question: I have bought these specimens because we are fairly new in saltwater keeping, and now these fish are very hardy and can forgive many of my mistakes that I will make (even if not on purpose). But for beautiful and super-hardy, and resistant that they are, BOY ARE THEY MESSY EATERS!!!,
<Yes they are!>
So, is there any chance with these 3 specimens for the NITRITE level to be 0.00?
<Well, with a properly cycled aquarium, the nitrifying bacteria population should "catch up" with the ammonia being produced by these specimens. Unfortunately, nitrite in an aquarium is a sure sign that something is out of whack. Sounds like too many (messy) fishes added to quickly to this aquarium. You need to really slow down a bit.>
Because I think it is almost impossible because the food they eat, and the way they eat.
<Not impossible...simply requires careful feeding, maintenance, and patience...>
If not, I already read the nitrite column on http://www.wetwebmedia.com/no2probfaqs.htm, but I do
water changes ever week like 20%, I do not overfeed, and still the NITRITE level is high.
<Well- a lingering high nitrite level is extremely dangerous for your fishes. I don't usually recommend this, but in this case, you may want to add one of the commercial nitrifying bacteria products to help "kick start" the cycle...As much as I'm a huge fan of regular water changes...it may be worth it to hold off a bit until the nitrite level returns to an undetectable level>
How often do you recommend water changes, and how much ????.
<Once a tank has been established, I like 5% water changes twice weekly>
In the store that I bought all my 3 fishes (Aquatic Warehouse) (great store!!!), they sell the salt water.
Do you recommend doing a massive water change 75% of the water they sell there, or doing water changes by mixing the scientific grade marine salt???
<I'd avoid the massive water changes at this point...observe nitrite levels for a few more days to see if they appear to be declining. You don't want to make a bad situation even worse by taking an impulsive action here. As far as purchasing pre-mixed water is concerned...Sure, you can do that, if it's easier and less expensive for you. But personally, I like to mix my own saltwater with RO/DI water. At least I can assure myself that the water is of consistent quality>
Any advice you can give me would be appreciated.. Thank You..
<Well, my best advice is to stay the course here. The nitrite level should ultimately go down with a little patience. It's too bad that the fish have to go through this, but I think massive water changes will just prolong their exposure to this problem. Also- reexamine your filtration and husbandry techniques...With time, diligent observation, careful action, and most of all, patience-things should work out for you! Hang in there! Regards, Scott F>

Prolonged Nitrite Cycle?
Hi,
<Hi there! Scott F. with you today!>
I have a 90 gallon tank. An Emperor 400 bio-wheel filter and a Fluval 404 canister filter. A 165 gph power head  for aeration. 220 watt power compact lighting (I leave on for 10 hours a day). A 400 watt heater. And crushed coral for substrate
I have setup this tank in early December with help from my LFS. I used 9 damsels to cycle my tank. Everything seemed to be going well. By early January my ammonia levels were at 0ppm and my nitrites were high (2-5ppm hard to tell with my test kit) nitrates 0 ppm. My damsels at this time were very active and eating well.  Shortly after I had a good amount of green algae in my tank and thought it was a good sign that my cycle may be complete. When I tested again my ammonia was 0 ppm, nitrite 2-5 ppm, and nitrates 40ppm. I brought a sample of water to the LFS and the confirmed my readings and said my tank was still cycling and the nitrites must be on there way down.  They did not recommend me to do a water change.
<I agree I would wait until the nitrite readings are undetectable before executing a water change>
So I waited. In early February I lost 3 fish (heavy breathing, possible white spots). Once again, I brought a water sample to the LFS and I still had the high nitrites (they measured it at 4ppm) no ammonia and my nitrates were 40ppm. They said the cause of death of the fish was stress due to the high nitrites and I should not worry about treating the tank for parasites.
<Well, I'd tend to agree...Unless you see signs of a parasitic illness, there is no need to treat for such a malady>
This morning I lost another 3 damsels.  I noticed that they lost most of their color and their gills were red.  The other fish are sluggish and color is fading.  I did a 25% water change today.  My readings were 0 ammonia, 2-5ppm nitrites ( I need a more accurate kit) and nitrates between still at 40ppm. I have not read another article pertaining to my current problem. It seams to me with all the articles I read that my nitrites should be dropping (almost 2 months since its peak) especially that I have a considerable amount of nitrates (the tank did start out with no nitrates so I am ruling out my tap water).  My water temp is consistently 78°, Sg 1.021. Any help will be appreciated.
Thanks, Jeff
<Well, Jeff- hard for me to be 100% certain what is causing this cycle to take so long to complete. Lingering nitrite levels are a sign of an immature biological "filter". Sounds like something is interrupting the maturation of the system. Are you doing anything which could be killing the beneficial bacteria in the system? Any medications, household chemicals, etc? The symptoms you describe sound like poisoning of some sort- either metabolite (i.e.; chronic ammonia/nitrite) or a toxin, such as a chemical of some sort. Do re-visit your husbandry techniques, equipment function, etc. There is a logical answer for this anomaly. Do some more digging and you will find it! Good luck! Regards, Scott F.>

Nitrites
hi bob,
Ok I tested my water in my 240 F.O tank. Here's the results
ammonia= 0
nitrites= <0.3mg/l - 0.3 mg/l
nitrates = 25 mg/l
My question is that on the nitrites the color chart for the test kit doesn't start from 0 it starts from
<0.3 mg/l to 3.3-33mg/l
So does that mean that nitrites are ALWAYS present in a healthy system??? 
<No my friend... should be undetectable... as in zero ppm or mg/l in a fully "cycled" up and going system... Any appreciable nitrite (or ammonia for the matter) is cause for concern... either the system is insufficiently filtered (aerated, circulated), and/or over/mis-fed, something is dead/dying in it, it's over-crowded/mis-stocked... Please read: http://wetwebmedia.com/no2probfaqs.htm>
And also do you think its a good time now to hook up my ozone generator to my skimmer???
<Yes>
My tank has been running for 4 weeks now. Thanks again your fan, Lee
<Direct your focus, ability, interest into study here... You'll soon be answering these queries (thanks in advance!). Bob Fenner>

Re: nitrites
Bob,
my Tetra Nitrite test kit graph/chart STARTS at <0.3 mg/l. When I testedmy water it was at the <0.3mg/l. Which is the lowest on their chart. This is what the Tetra test kit instruction says. Ill punch it in for you in exact words . " Ideally nitrite levels should be kept below 0.8mg/l."
<Hmm, do agree... I generally state "1.0 ppm" out of laziness, assuredness that this value is most easily remembered...>
" If nitrite levels is above 1.6mg/l, carry out a partial water change". 
<Well... this doesn't seem logical (to me obviously)... I caution folks to do such a change at or above "1.0 ppm" (or mg/l)... for the same expedients mentioned above>
"Biologically active and efficient filtration will keep nitrite levels at a very low and safe level". So to me Bob it sounds like Tetra is saying that there will ALWAYS be some presents in nitrites. Yet you told me that nitrites should be at 0mg/l. What is your opinion regards to this . Your big fan.
<Still a fan? Well... I'm still of the opinion that they (nitrites) should be zip, zero, zilch... Do query the various electronic bulletin boards, chatforums (here's WWM's: http://talk.wetwebfotos.com/), or published works... S/b nada, none... Bob Fenner, who IS a big fan of Tetra/Pfizer... but not their English inserts. labeling at times.>
Lee