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Old 11-19-2004, 12:15 AM   #1
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Denitrifying Bacteria

I've been reading multiple posts about denitrifying bacteria that rid tanks of nitrates, but what is the best way grow large colonies of these anaerobic bacteria. I know live rock is suitable, and a fuge is out of the question on my 20 gallon tank.
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Old 11-19-2004, 12:25 AM   #2
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DSB
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54g all-glass bowfront corner planted FW

Red tiger lilly, Rotala Indica, Sagittaria Subulata, Micro Sword, Cardinal Plant
Fluorite Black sand and gravel
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Old 11-19-2004, 12:29 AM   #3
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how deep?
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Old 11-19-2004, 12:30 AM   #4
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depends on the grain. smaller grains don't have to be as deep. Read up a LOT on DSB before you decide to go that route.
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54g all-glass bowfront corner planted FW

Red tiger lilly, Rotala Indica, Sagittaria Subulata, Micro Sword, Cardinal Plant
Fluorite Black sand and gravel
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Old 11-19-2004, 12:36 AM   #5
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know of some useful articles?
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Old 11-19-2004, 12:53 PM   #6
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I think in a 20 gal tank having a DSB 4-6"+ would take away needed water volume. The bacteria can grow in low oxygen areas of the tank. Under LR, if you have porous LR it can grow in the LR also.
Do a google search on this and you will find a lot to read.
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Old 11-19-2004, 02:25 PM   #7
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just to play devils advocate mattmku have you ever seen a dsb in a tank? They are ugly as sin IMO. I know the dsb supporters will probably start thrashing me any minute but they are very unappealing. Yes they do work well for some but if nitrates are your only concern there are other more aesthetically pleasing alternatives. The best thing to do first is figure out why your nitrates are high(I am assuming they are) and try and deal with that. It could be the water you are using,overfeeding or something has died causing some spikes. Why is a fuge out of the question? Limited space?
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Old 11-19-2004, 03:47 PM   #8
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There won't be any thrashing. Everyone is intitled to their opinion and both sides have valid arguments.

In terms of how they look. A lot of the "thick front of moldy lookin junk" can be offset by sloping your DSB down in the front to minimize that. Also, I think a lot of people take the "Deep" part of a DSB a little too far. I don't think you need 6" of sand in a fish tank. I have 3-4 inches, which only comes up over the plastic trim of my 55 by about 1 to 1-1/2 inches. I hardly even notice it.

The Eskimo's points on finding the cause is important. If you can't find a source for it then you can start thinking about filtration (LR/LS/Fuge). But you should first rule out the possability of an external source such as those listed by Eskimo.
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Old 11-20-2004, 05:04 PM   #9
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Eskimo, I think i agree with you on the dsb in the tank, but i really don't have room for a fuge. I bought a canister filter a few months back and looking back I wish i wouldn't have. ???
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Old 11-20-2004, 05:30 PM   #10
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You can use a hang on back filter for a fuge. For a 2o gal you don't need that big of a fuge
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