From the outside ponds and glass jars of antiquity, fashionable aquaria have advanced into a wide range of specialized techniques. Individual aquaria can differ in size from a small bowl large sufficient for only a single small fish, to the large public aquaria that may simulate complete marine ecosystems. Dissolved oxygen enters the system on the surface water-air interface. The phosphate cycle is an important, though often missed, nutrient cycle. Sulfur, iron, and micronutrients additionally cycle via the system, coming into as food and exiting as waste. Appropriate dealing with of the nitrogen cycle, along with supplying an adequately balanced meals provide and regarded organic loading, is adequate to maintain these different nutrient cycles in approximate equilibrium.
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