Cycled and absence of nitrate - The Planted Tank Forum
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post #1 of 3 (permalink) Old 01-22-2019, 11:58 PM Thread Starter
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Cycled and absence of nitrate

Ok, I'm having a hard time wrapping my head around this.
I've cycled scores of tanks. I always seem to end up with between 40 to 80 PPM of nitrate when the cycle is complete.
This tank is different. It just finished it's cycle and it's nitrates are at about 2.5 ppm.
What is different about this tank, is i have a few small plants. 1 Annubias, 2 small java ferns and a few sprigs of anachris. Would these 6 plants be enough to reduce nitrates down that far in a 75 gallon in a week or so?
Seems sketchy to me.
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post #2 of 3 (permalink) Old 01-23-2019, 01:44 AM
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Sometimes we get involved in a bit of confusion on the term "cycled", so please bare with me while I ask a few questions.
Do you mean you have been adding ammonia, testing to see it is being converted to nitrite and then that converted to nitrate? Or perhaps you are using "cycled" in a different way?
Some info on how the cycle was done and how it moved along will let us give you better info on what we would expect. As a first thought, anacharis is a bit of a hog on nitrate but it sounds really too good for those levels, so a second thought might be to assure myself that the test result is not wrong and messing with your mind?
Sorry, but the first shot is sometimes in the totally wrong direction!
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post #3 of 3 (permalink) Old 01-23-2019, 02:01 AM Thread Starter
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Sorry about that.
I did a fishless ammonia cycle. I added the plants after the nitrosomanas were able to reduce 1ppm of ammonia to 0 within a 24 hour period. At this point there was well over 10ppm of nitrite.
I did test nitrate once and it was at 20ppm at that time. But I was more focused on testing nitrite to watch for the end of the cycle. I did not test nitrate again until after nitrite had reached 0ppm. And to my surprise, ~2.5ppm.
In all my tank cycles, this is the first time I have seen that. But it's also the first time with plants.

And to add... I tested a new tank at work I am cycling with the same test kit, and it's at 30ppm nitrate with maxed out nitrite. So I suspect that one will fall in line with the rest of the data points I have seen.

75 gallon reef to planted tank conversion. Definite work in progress! TJ Here
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Last edited by Darkblade48; 01-28-2019 at 04:32 AM. Reason: Please use the edit function for back to back posts to keep threads cleaner
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