Seachem De*Nitrate - The Planted Tank Forum
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post #1 of 33 (permalink) Old 07-19-2011, 12:07 PM Thread Starter
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Seachem De*Nitrate

Does anyone use Seachem De*Nitrate in their planted tank(s)?
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post #2 of 33 (permalink) Old 07-19-2011, 12:56 PM
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explain why you would want to use that in a planted tank? plants would be more effective at removing nitrates.
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post #3 of 33 (permalink) Old 07-19-2011, 01:09 PM Thread Starter
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Well lots of people use Purigen in planted tanks and thats claimed by Seachem to remove nitrates as well.
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post #4 of 33 (permalink) Old 07-19-2011, 01:23 PM
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Correct me if I am wrong, but most people that use Seachem's Purigen in planted tanks are using it for water clarity.... not for removing Nitrates. Also, I'm pretty sure Purigen doesn't remove much, if any nitrates from the water. I thought it just detoxified nitrates makingg them harmless.
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post #5 of 33 (permalink) Old 07-19-2011, 03:44 PM
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Purigen claims that it doesn't remove any of the fertilizers we may add to our tanks, that being said. i've never seen clearer water than what good bacteria can do.. especially when plants are used in conjunction. Bacteria and plants have been natures filters for a LONG time.. why would you change that?
and your plants will suffer if you use de nitrate. if ur nitrates are too high, do a water change

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post #6 of 33 (permalink) Old 07-19-2011, 04:37 PM
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Correct me if I'm wrong, but isn't De*nitrate an anaerobic medium that would help turn nitrates into nitrogen?

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post #7 of 33 (permalink) Old 07-19-2011, 04:43 PM
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I'm no chemist, but I'm pretty sure that any process that converts nitrates to nitrogen will also release a lot of energy - get very hot. It is a pointless process for a planted tank. Converting nitrogen to nitrates is a very beneficial process. The reverse is usually used only when you want a big bang to occur.

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post #8 of 33 (permalink) Old 07-19-2011, 06:16 PM
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According to Seachems site, denitrate is a bio media that functions to remove nitrate ( as does any biomedia ) anaerobically and aerobically if the flow rate is less than 50 gph which is how it is intended to be used. For flow rates above 50 gph it functions aerobically only so they recommend Matrix for flow rates over 50 gph.

Purigen removes dissolved organic compounds so it does remove organic nitrates which would be those generated from the breakdown of organic wastes - fish poop, decaying plant matter, etc. It does not remove inorganic nitrates such as KNO3.
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post #9 of 33 (permalink) Old 07-20-2011, 03:55 AM Thread Starter
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Looking at the product I dont see how it can work any different to Eheim filter medias.

It's not doing any chemical reaction, just biological.
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post #10 of 33 (permalink) Old 07-20-2011, 04:13 AM
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Quote:
Originally Posted by Hoppy View Post
I'm no chemist, but I'm pretty sure that any process that converts nitrates to nitrogen will also release a lot of energy - get very hot. It is a pointless process for a planted tank. Converting nitrogen to nitrates is a very beneficial process. The reverse is usually used only when you want a big bang to occur.

Nitrate to nitrogen gas conversion happens all the time in nature. Bacteria harness that energy for life. It's what keeps the nitrogen cycle going....The reverse is when you want little to no nitrates in your tank....


It seems to me that this stuff is doing what live rock does in SW: denitrification...as to how well it works that's up to you.
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post #11 of 33 (permalink) Old 07-20-2011, 05:26 AM
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There is no reason to want to remove nitrates from a planted tank. We dose nitrates to keep the plants healthy. And, the amount of nitrates that is a problem is so high that we aren't going to ever see it unless we dose a super heavy dose intentionally.

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post #12 of 33 (permalink) Old 07-20-2011, 11:52 AM
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I'm currently using Seachem Matrix in my canister filter which is the same thing but for higher flow rates, although I don't have any particular data to verify its effectiveness or whether the flow rate there is still too great for it to work optimally.

Deep within the porous structure of the granules, the water flow is supposed to be slow enough to allow anerobic bacteria to denitrify the water. Basically, the anerobic bacteria are equipped to be able to strip the oxygen from the nitrates in order to provide for their own respiration and survival, with the byproduct being harmless nitrogen gas which just gasses out of the aquarium then. It's the same reason reef aquarists have been using live rock in their tanks for years, as anerobic bacteria do reside within it.

I do still have some level of nitrates in my water so it's not depleting them entirely, although I can't tell at what level due to my test kit being rubbish. And I'm not sure how much of the nitrates produced are being absorbed by my plants versus the Matrix. The plants do seem healthy but I haven't seen a great deal of new growth, so I may be limited on some nutrient being that I'm not dosing much of anything. As such, the Seachem Matrix is at minimum a significant safeguard to ensure that my nitrates don't escalate in case my plants aren't consuming them for any reason.

And theoretically, an aneorobic filter medium such as these would allow you higher fauna stocking densities without excess nitrates resulting, in case your plants alone can't keep up with them. And if your nitrates are getting depleted then just reduce the amount of media that you're using to rebalance things out. My tank is a bit of a trial and is heavily overstocked I must admit, with generous feedings and no water changes. My trial methodology is perhaps a bit different than the usual approach, and seems to be working thus far although that's not long enough to draw conclusions from for its long term effectiveness. And water changes wouldn't help me reduce my nitrates either, being that my tap water has higher nitrates than my tank does...
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post #13 of 33 (permalink) Old 07-20-2011, 12:20 PM
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don't anerobic bacteria produce, ammonia by doing what is proposed here? i thought aerobic was the only BB in our systems? and anerobic was technically bad because it reduces the effectiveness of BB

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post #14 of 33 (permalink) Old 07-20-2011, 12:45 PM
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Quote:
Originally Posted by HD Blazingwolf View Post
don't anerobic bacteria produce, ammonia by doing what is proposed here? i thought aerobic was the only BB in our systems? and anerobic was technically bad because it reduces the effectiveness of BB
Nitrogen fixation goes from

N2 -> NH3 -> NO3 -> Proteins -> NH3 -> NO3 -> N2 and so forth.

Anaerobicity (not sure if that's a word) is bad only because it's hard to control. A byproduct is H2S gas which is toxic (how toxic is up to debate). Deep sand beds and filter materials like this and live rock are examples of anaerobic conditions put to good use. The latter two are much more controllable though.
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post #15 of 33 (permalink) Old 07-20-2011, 04:51 PM
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so technically the anaerobic bacteria is bad correct? its creating the very products we are hoping our BB bacteria will convert thus being used by plants

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