Dirt for aquarium substrate
 

Could I go about using a sterilized dirt mix or topsoil for an aquarium substrate instead of rocks or sand? I want a more realistic look for my Map, Mud, and Musk Turtle tanks. Thanks!

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Dirt + water = mud. It won't just nicely settle to the bottom like gravel or sand; you will literally have black muddy water to the point that you can't view your turtles.