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How much laterite, river sand

Hi all,

I am planning to buy a new 90 gal tank and this time I want to apply all
the good stuff I have learned from this list, where I have been lurking
for months. In this tank I want to use laterite in the lower third of
the substrate. My question is, how many pounds of laterite will I need?
The tank's bottom area is a bit over 648 sq. inches. Any rules of thumb?

Another question. In the book "The Natural Aquarium", the author uses
river sand as substrate in many of the tanks. Does anyone in the list
use river sand? Is river sand something you must collect yourself, or
can it be bought? I like the dark color that river sand has, as opposed
to the light color of "regular" sand.

Thanks in advance for your input.


Guillermo Vega-Toro
guillermo_vegatoro at stercomm_com