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I am setting up a 75 gallon tank hoping to get started a planted aquarium. I 
bought some tropical isle laterite by Carib Sea.  It is red in color about 4 
to 5 centimeters in width. My question is: can I use this product as is or do 
I need to mix it with some other substrate like sand or gravel?  If so, how 
much sand or gravel?  I plan to add 1 to 2" of gravel on top of the laterite. 
 Does this sound reasonable?  Thanks for any of your thoughts on this. Frank