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Re: algal blooms

To effectivley control algae, you need to remove an essential nutrient
from the water column. Some people advocate iron, some suggest phosphate,
other people swear by nitrogen. Personally, I favor phosphate because iron
is a micronutrient and is required in very small amounts, and nitrogen can
be fixed by blue-green algae. At any rate, your analysis indicates high
levels of all three... 1-2 ppm phosphate is huge for instance, and will
continue to cause you problems no matter how much carbon dioxide you add
to your tank.