Trace Elements
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In the Aquarium
First of all, it is necessary to distinguish the importance of the different elements present in larger quantities (N, P, S, K, Ca, Mg: 0.05 - 8 % of solids) and trace elements (Fe, Mn, Zn, Cu, Mo, Co, Ni, B: 0.2 - 7000 ppm of solids). There are several starting points for such definitions, but all of them have the same problem; it is difficult to make a clear distinction.
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Further...
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For animals
Boron
Only in the last 15 years has it become clear that boron is also essential for human and animal nutrition...
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Further...
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For aquatic plants
| C |
O |
H |
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| N |
P |
S |
B |
Cl |
(Si) |
(Se) |
Non-metals |
| K |
Ca |
Mg |
(Na) |
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Metals |
| Fe |
Mn |
Zn |
Cu |
Mo |
(Co) |
Ni |
Heavy metals |
At present, silicon, sodium and cobalt have been proved necessary for only a few cultures; they are otherwise considered to be useful, as are - with some restrictions - aluminium and selenium.
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Further...
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