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[APD] Re: fresh water / nitrates / plant growth

It's my understanding that there are 'super micronutrients' that are used in such small amounts that it's impractical to include them in trace element mixes. Stuff like Beryliium, which is also used to power spaceships when in large spherical form. In a closed system like an aquarium they get used up, so water changes replenish them. Not sure if that dynamic applies to ponds.


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