It 'a personal website in English that contains some wonderful articles including some about aquarium startup and others about fertilization.
One of the reasons why it is very well known is that it allow to download a program to calculate the dosages of fertilizer elements to make DIY fertilizers.
Hidden in the articles there is a web version of this program which can be used on-line.
Another tool available allows the calculation of CO2 starting from pH and KH values.
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