vermiculite, iron, and potassium
I recently read the book "Hydroponics for the Home Gardener." It had some
interesting information that I have never heard about in my readings of
For people using vermiculite:
"the vermiculite you use should have as neutral a pH as possible and no
toxic amounts of boron or flourine."
Regarding trace elements:
"Iron becomes less available to the plant as the hardness of the water
"Under very humid conditions, where the light level is lower, you plant will
require more potassium -- as much as twice the normal amount. This is
because photosynthesis is more difficult with a lower light level and
potassium is necessary for photosynthesis."
I know hydroponics is drastically different from an aquarium, but does
anyone have any thoughts on whether the above applies to aquariums?