nitrate?

No. Nitrate is not toxic at low concentrations at all to fish. It is really corals that are sensitive to it.

And Welcome :)
 
tnt, it depends at which stage your tank is in (such as how long you've set it up), what else is in it, and what your other parameters are, especially ammonia & nitrite. For example, in a FOWLR, that's not great and will probably cause algae problems, but I wouldn't freak out about it. If you are setting up an SPS tank and ready to throw in valuable SPS, clams and an anemone, I would say you are very bad off.
 
It will not be enough to kill a fish (do you have a fish only tank?). Only the most sensitive fish will be stressed or killed by levels above 50 (even 100), such as some butterfly fish. Some corals are more or less tolerant at these levels, some are almost completely intolerant. In any case, less is always better and zero is preferable to any other level. But I sincerlely doubt that these levels will kill a fish--so I rate it a 4 or 5--moderate alarm, simply put that it should be lower.
 
if it is a fish only... don't panic. do a small water change... good target number for routine maint... if you have inverts, corals... you should have paniced a couple of days ago.
 
The original question was:

"how severe is a nitrate level of 40 ppm? severe enough to kill a fish? (1-10) one being not a big deal."

The question has nothing to do with SPS and clams.

Therefore correct answer is ONE. 40ppm of nitrate will not kill a fish.
 
Treat it not as an immdiate alarm, but as a challenge with the tank that needs to be dealt with given the presence of the anemone in particular. You need to establish the root cause (source) of the nitrates. The maturity of the tank is a big variable here.

A series of large water changes are a straightforward way to address the nitrate levels. Or pursue another method of nitrate reduction.

Heres a good link with more information.

http://www.advancedaquarist.com/issues/august2003/chem.htm

How long has the tank been set up?

The best way for us to help you is for you to give us more information about your set up and other water parameters.
 
im not really sure on set up time, because i wasnt involved in the set up. Atleast since school started this year, so august atleast and some time longer than that. because it had been set up for atleast a little while at that point. The tank was set up with tap water(i wasnt around then). It apparently hasnt had a water change in 6 weeks till today when i did a 5 gallon change on it. Its a 75 gallon. I was going to do more but i didnt have time to mix any more water. I would asssume the causes are tap water, lack of dsb/plenum, an ugf with crushed coral (detritus trap which i intend to fix with doing away with the ugf and switching to sugar sand), and very little live rock (some base rock besides that but still not enough and i dont think it has had time to seed yet). I am on the way to getting this tank ready for some sps as soon as i can get the issues adressed.
 
Not sure what your future plans are other than you mention SPS. I love the functionality and looks of a DSB, but I think you may want to go barebottom with SPS. I have some SPS and really wish I could up the flow in my tank, but the sand prevents it. When i finally get my large tank for SPS it will be BB, but with a remote DSB.
 
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