how much should i use for a 50 gallon? They measure in liters, and there are no converters online. Also, are there only those three types (i.e. AMAZONIA, AFRICANA, AND I DON'T REMEMBER THE LAST ONE) But they are kinda ugly looking, i wanted a lighter colored sand. They do make this Niger sand that looks awesome, can I mix the two, and get like a median, or is it just best to stick with only Aquasoil?