Which type of sand should I use for my aquarium.  There are three
types that I know of, Silica sand, Crushed coral or beach sand, and
the Play sand that they sell at hardware stores.  Alternatively I could
collect some form a local creek.  

Also, which fertilizers should I use in the substrate.  Is there an 
inexpensive source for Laterite, or do people recommend that I put
a layer of potting soil beneath the sand.

All responses are arppreciated,

Eric Schoville
schovill at expert_cc.purdue.edu