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Old 26-03-2007, 05:53 PM posted to rec.aquaria.freshwater.plants
Richard Sexton Richard Sexton is offline
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Default NO3 level and growth of aquatic plant ref: Paul Krombholz 1966

In article .com,
On Mar 25, 6:02 pm, (Richard Sexton) wrote:
In article . com,

There are no known detrimental effects on plants at extreme levels(NH4
is quite another matter), fish and the most sensitive will be Amano
shrimps etc.

I used these shrimp in a toxicity study, I found no adversed effects
at 160ppm(the limit of the test method, it was likely higher). No fish
or plant impacts where noted. I used KNO3 to dose, as did Paul.

I slipped a decimal once and dosed at 200 ppm of know instead of 20.

I let it go for 3 weeks to see what would happen. The tips of a couple
of crypts curled a little bit but the 16 ammano shrimp were unaffected.

Well, 3 weeks is a good time frame.
I just did a 3 day acute, but that did not address the fish waste and
other residual NO3, that's just what was added on top of what was
there, added internally.

I should also point out that although these 16 shrimp survived 3 weeks
at 200 ppm nitrate with zero obervable effect, the same is NOT true
for ammonia.

A few months later I got a large number of emerse grown crypts and put them
in the same tank. Of course the first thing an emersed crypt does underwater
is let its leaves melt and rot. One day 2/4 of the shrimp appeared dead
and white - not pink. I moed them all to a clean tank and nearly all recovered.

The ammonia level in that tank BARELY registered on my test kit.

So yeah, nitrate good, ammonia bad. The fish and plants didn't care, but
the shrimp are much more sensitive.

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