Glouglou

If Boron is limited it can sometimes block the calcium uptake of plants.

The level in dry freshwater plants is 26 to 382 mg/kg

In Japan, South Africa, and South America the Boron concentration in freshwater is generally below 0.3 mg/litre

http://www.greenfacts.org/en/boron/l-2/boron-3.htm#1

Do you think it will be the concentration needed in aquarium?

Most of the time, in natural setup, the concentration is much lower for most nutrient compare to our aquarium. I guess it’s because you get a lot more water movment and the soil is a lot more rich???

Somebody already use boron to recover from a calcium deficiency?

Did you use Boric acid and in what concentration?

Thanks