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Here is a link to a calculator that will help you calculate how much substrate you will need if you go with a commercially available substrate.
http://www.plantedtank.net/substratecalculator.html
As for the depth of substrate, I usually try to have somewhere between two and five inches of substrate. I don't normally try to create an even level throughout the tank. Instead I will slope the substrate from the front to the back corners to create mounds. It all depends on the desired effect and the type of plants intended to be planted. Some plants do fine with approximately one inch of substrate (i.e. glosso).
http://www.plantedtank.net/substratecalculator.html
As for the depth of substrate, I usually try to have somewhere between two and five inches of substrate. I don't normally try to create an even level throughout the tank. Instead I will slope the substrate from the front to the back corners to create mounds. It all depends on the desired effect and the type of plants intended to be planted. Some plants do fine with approximately one inch of substrate (i.e. glosso).
