The gravel serves as a home to the nitrifying bacteria that convert ammonia to nitrite and then to nitrate, which can be used by the plants. As a general rule, you can support 1 – 2 square feet of growing area for every 10 gallons of fish tank water.
The larger the tank, the larger grow bed area you can support. The standard sized fish aquariums of 10 and 20 gallons are also reasonably priced. They hold about 3 gallons and are quite inexpensive. Small, clean plastic amphibian cages, available in most pet shops, make an excellent mini-system. We recommend anything between 3 – 20 gallons, although, you can go with a larger tank if you have the space. The fish tank can be a glass or plexi-glass aquarium or you can use any other clean container that holds water: for example, a plastic tub, bucket or barrel.
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