Denitrification - Page 3 - The Planted Tank Forum
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post #31 of 38 (permalink) Old 04-28-2019, 11:13 PM
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Agreed!



Don't even get me started on CEC haha



I was aware of roots bringing oxygen to the lower substrate but didn't think of it being so severe it would prevent the denitro process. So you would submit that the height of the substrate would have to be based on the expected length of the root systems?
Ever pulled up root system of a long established colony of crypts? Maybe a A. Crispus that’s been there a year or more? 3-4” down in gravel I know for sure, my old 65gal breeder was on frame stand where you could see bottom glass and use a flashlight to look at them. It was 3.5-4” gravel depth in back and there was no shortage of roots down that deep from crown type plants that were there long enough to grow that deep. Pretty sure there weren’t any anaerobic pockets anywhere those roots went.

Never had a tank with any gravel over that deep though.

Made mistake of trying a water hawthorn once. Once that 1st banana shaped floating leaf hit surface it went in super overdrive, within a month roots had fanned out to cover glass of 18” wide tank at bottom glass, growing 12+ new floating leaves a week. I couldn’t keep up with it. Nitrates and iron plummeted to zero in tank. Water top completely covered in those floating leaves. Had to get rid of it or would have completely smothered out all my other plants nor would I be able to afford keeping up with dosing. Would never try that again unless I had a 200gal tank I could devote entire end to it.

Apparently not only are tops of it’s leaves sunlight and co2 collectors that pump down to roots but bottom sides of floating leaves are also nutrient collectors as well. Can understand why it such a good pond plant though. That one plant could easily handle a 100gal tank with a fair sized fish load. Flowers are pretty also and have a nice smell to them.
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post #32 of 38 (permalink) Old 04-29-2019, 01:25 AM
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Needs moar Phlame Tetras. You can never have enouph Phlame Tetras.
They are a neat phish, but weigh heavy on gluttony!
I started with 6, they were wild caught LFS informed me, only 2 survived.
They only receive them like twice a year and don't stay @ LFS for long.


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Originally Posted by symstep View Post
Maybe one day i'll get there haha. But until then, if you haven't seen this channel you should. It actually is the most effort put into explaining this concept that I've seen so far.
Guy first did it with his turtle/cherry shrimp tank and now he is doing it with fish.
Not picking on you in any way and nor have you stirred the kettle.
We all of course like planted tank pics!!!

I attempted the video but my attention span gets weak after a few minutes.
Turtles can live in sewage and surface to breath periodically.
I will try again.

Back to denitrification:
I have a 75G tank that has lower light, I'm not really driving the plants hard.
It's more of a repository for species I don't wish to part with but keep them going.
It has a 4" PVC in tank filter in the corner.
Maybe I need larger lava rock in the PVC???
Been cycled for 4 years but does not break down NO3 to N.

If I turn up the lighting and CO2 it will just be another farm tank with excessive trimming.
It needs to be the "relax don't sweat it tank".


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post #33 of 38 (permalink) Old 04-29-2019, 08:07 PM
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Maryland Guppy,
doesn’t this video explain where your unusually high NO3 plant uptake go?


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post #34 of 38 (permalink) Old 04-29-2019, 09:59 PM
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Maryland Guppy,
doesn’t this video explain where your unusually high NO3 plant uptake go?

https://www.youtube.com/watch?v=_gYIZ_O_D_o
The nitrate consuming tank has no deep substrate nor does the 75G.
But if larger lava rock in the filter would work it could be a win.
I'll have to explain the 75G in more detail when I'm home.


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post #35 of 38 (permalink) Old 04-29-2019, 10:16 PM
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The nitrate consuming tank has no deep substrate nor does the 75G.
In the video is substrate only 2”/5cm deep and it already removes nitrate.

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post #36 of 38 (permalink) Old 04-30-2019, 12:05 AM
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All of my substrate was new BDBS about 1.5" deep 6-8 weeks ago.
That's in the tank I'm measuring fert uptake.

75G is 4 year old STS about 2" deep and it denitrifies nothing.
It does have cycled lava rock in a filter but no large pieces.
All lava rock is no larger than an inch.


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post #37 of 38 (permalink) Old 04-30-2019, 04:01 PM Thread Starter
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Ever pulled up root system of a long established colony of crypts?
Unfortunately not to that extent. Now that you mention it, I did move a few crypts around not that long ago and a few of those roots were about 8 inches long. I went back and looked at some of the examples and the do have rooted plants so now I feel a little lost. Perhaps over estimating the potential of roots preventing anoxic conditions?
As for you water hawthorn, do you recall a PH reading?

I just want to learn. I appreciate everyone who teaches.

Last edited by symstep; 05-11-2019 at 02:51 PM. Reason: To Edit
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post #38 of 38 (permalink) Old 04-30-2019, 04:16 PM Thread Starter
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Not picking on you in any way and nor have you stirred the kettle.
Oh I know Just wanted to clarify that I haven't tried this out yet and hopefully I will accomplish it. Also I had no idea I was getting into such a hot topic. As for your 75 gallon, I assume there is no NH3 and NO2 yes?

I just want to learn. I appreciate everyone who teaches.
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deep sand bed, denitrification, nitrate, substrate, water change

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