Why does BGA thrive in a low nitrate environment? and what does it "eat"? - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 07-12-2005, 07:15 PM Thread Starter
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Post Why does BGA thrive in a low nitrate environment? and what does it "eat"?

I don't get it....why do algaes thrive in a high nitrate environment and this bacteria doesn't?
All you Brainiacks don't be afraid to be as acurate and factual as you can.
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post #2 of 7 (permalink) Old 07-12-2005, 07:41 PM
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If I remember correctly, BGA specilised in extracting nitrogen from air.

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post #3 of 7 (permalink) Old 07-12-2005, 07:58 PM Thread Starter
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So how does higher NO3 and CO2 impeid this process?
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post #4 of 7 (permalink) Old 07-18-2005, 07:34 AM
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Because BGA is adapted well to low nutrients, like a smaller critter needs less than a much much much larger one(plants).

Plants can use the nutrients much better when the concentrations are higher, BGA can when they are lower(but they max out their uptake at a lower concentration as well while the plants keep increasing the uptake rates).

It has nothing to do with air N2 sources, they simply don't need much, just like GW which can also easily survive on extremely little NO3..........it cannot use N2, but does fine.................our tanks are __far__ from NO3 limiting to BGA..........

Grow the plants, the algae will no longer grow well.
But.......something will grow, you have a choice of what.

Regards,
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post #5 of 7 (permalink) Old 07-18-2005, 07:44 AM
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The way I think about it with all algaes (and I could be dead wrong) is that with enough/excess nutrients, including CO2 and light, the algae/BGA chokes on their food source.

That about right?
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post #6 of 7 (permalink) Old 07-18-2005, 09:39 AM
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That I can confirm isn't right. I have tried taking some very nutrient rich water from my tank, put the water into a tank without plants, give the tank lots of CO2 and light. 1 week later, I had a algae jungle with lots of thread algaes, some BBA in dark concers, and quite a bit of GSA as well.

So I guess its got to be something to do with healthy plants, and lots of them.

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Specs:
800L 100% Flourite
80L plant/shrimps nursery tank inconnected with the main tank
Total 600W HQI, 2 X 5200K 2 X 6500K
Eheim 2028 X 2 2080 X 1
Dupla Substrate Heater
Dupla S external reactor
Aquamedic 2hp & Teco R15 400W chillers
Sega pH Controller

Light period: 6 hours on each bulb across 12 hours
Water Parameters: pH 6.4, KH 2, GH 1, NO3 40, PO4 1 TDS 250
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post #7 of 7 (permalink) Old 07-18-2005, 03:04 PM
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Quote:
Originally Posted by weaver
The way I think about it with all algaes (and I could be dead wrong) is that with enough/excess nutrients, including CO2 and light, the algae/BGA chokes on their food source.

That about right?
No, in a pure competition case, the larger animal simply uses much more when more is available.

Much like mice vs elephants, both are herbivores but a mouse can live on far less, reproduce much faster etc...........

Algae does not choke, rather, it knows someone else is there and the nutrient levels tell the algae/BGA that it's time to make spores till the next time the environment is right.

Regards.,

Tom Barr



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