High nitrates in source water. - Page 2 - Tropical Fish Keeping - Aquarium fish care and resources
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post #11 of 16 Old 04-22-2013, 11:24 AM
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Originally Posted by pop View Post
Ps is there a natural or organic solution to the nitrate problem that could be used??
!
A properly set up planted tank can be a huge nitrate hog.

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post #12 of 16 Old 04-22-2013, 12:46 PM Thread Starter
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Originally Posted by Mikaila31 View Post
A properly set up planted tank can be a huge nitrate hog.
Plants primarily assimilate ammonia/ammonium thus preventing nitrates and only secondarily (and with greater difficulty) assimilate nitrates. Even a heavily planted tank plants can only process the ammonia generated from a lightly stocked tank. The partial weekly water change (assuming zero nitrate source) handles the rest.
I think it's best to use nitrate free water for partial water changes rather than add 80+ppm nitrate source water and hope plants will remove it along with the tank generated ammonia processing. Of course if there's a a DOE study that proves this incorrect, I'd be reading it.

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post #13 of 16 Old 04-22-2013, 05:10 PM
I know we have had this discussion before lol. We do things totally different and that is fine. But a properly setup planted tank can consume more then what a fully stocked tank can produce. Typically nitrates only show up in some cases because they are processed by the filter which is directly competing with the plants of the ideal ammonia. Even with heavy stock and EI dosing, nitrates in my tanks get consumed pretty rapidly. Either the plants are consuming them or they are getting suck into a black hole. I don't dose 20+ppm a week just for lolz. There was once a article by walstad comparing nitrogen uptake available online. You are correct of course that ammonia is uptaken most readily, but I feel you are underestimating the nitrate uptake that can happen in a productive planted tank.

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post #14 of 16 Old 04-22-2013, 05:58 PM
Forgot to add, most RO units I see suggest around 40PSI. The cheap portable unit I got off ebay for around $60 needs 35PSI which is doable on most house systems including wells. I use it only occasionally and it currently generates water with around 5-10 TDS. Also using a RO/Tap mix usually avoid the need for any additives.

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post #15 of 16 Old 04-22-2013, 06:10 PM
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My plants take up around 20 ppm of nitrates a week which I dose and what ever my fish and shrimp produce.
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post #16 of 16 Old 04-22-2013, 07:43 PM Thread Starter
The point that's being missed here I think is that I suspect that the source water that most use for water changes is not 80-100ppm in nitrates. I'm controlling tank generated nitrates fine, the modified tap water filter is to produce nitrate free water for weekly water changes!
Surely nobody would recommend doing water changes with water so high in nitrates? After all, nitrate removal is one of the reasons we do water changes.

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Last edited by AbbeysDad; 04-22-2013 at 09:21 PM.
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