Most of the popular fertilization methods out there have the same goal[algae free tanks!] and the never work for a tank that is already infected heavily with algae. You have to start with a clean tank!
The important thing is to work with known elements.
Don't be smart and dig soil from your garden. [to me it's a big risk]
If you are lucky it does not contain toxins.
Heavy metals, asbestos etc.
If you are not you might be put off from aquascaping because a rock has been leaching toxins that kill off the beneficial bacteria causing a domino effect of disasters.
Something unknown like that will skew your experience path.
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