Nitrate

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Having known that nitrate makes zooanthellae in corals prolifferate and at reeeely high concentrations fish  find it harder to breathe, I was interested to read today that  growth can be cut by as much as 50%(stony corals) by concentrations up to 40ppm, thats as high as they tested it....

Thats news to me and interesting? Yeah OK i bet you all know that .... :rolleyes:

In the tank ive posted  a picture of it was over 100ppm..........Things seemed to grow well, posphate was 3ppm with a Salifert kit so it most likely was more....
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Mike

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Reply #1

Sounds a bit converse doesn't it, that the zooxanthallae that feed the coral - proliferating would decrease it's growth, but they do. (You can see it, as corals go brown(er) with high nitrate and phosphate and the most colourful corals are those with low nitrate and phosphate (so low-ish zoox) but very bright lighting to compensate, which in turn causes the coral's protective colour pigments to strengthen).

Nitrate is often associated with algae, and indeed the growth of algae is often spurred by excess nutrients, including nitrate. Other potential aquarium pests, such as dinoflagellates, are also spurred by excess nitrate and other nutrients. Nitrate itself is not particularly toxic at the levels usually found in aquaria, at least as is so far known in the scientific literature. Nevertheless, elevated nitrate levels can excessively spur the growth of zooxanthellae, which in turn can actually decrease the growth rate of their host coral.

See paragraph about half way down about Nitrate. It doesn't seem to elaborate on exactly why, and I'm not sure either, but would like to know...
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Carol

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Reply #2

Ah right its something to do with oxygen i think hang on let me find the....




mgg.rsmas.miami.edu/groups/bio/20070202114319668.pdf




Ahhhh found it .




When I used Zeospur elements i was basicaly starving the corals of  thier zoowotshit , so when i ran out and couldnt renew the supply many of them suffered as they could not replenish zoodoodah quick enough..never again i told myself.
Do not mock the snake because it has no horns.For who is to say that one day it may become a dragon,as one just man may become an army...Water Margin.

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