Here is a 75 gallon Livebearer tank with mollies, platies, and guppies. The substrate is 1 inch (2.54 cm) Miracle Gro Organic Garden Soil mixed with peat moss and cow manure. The dirt is capped with 2 inches of pool filter sand. The plants are Swords, Dwarf Sags, rotala, octopus plant, and...