The next time you change the aquarium water be sure to save the old water for the garden.
Although not as potent as fish emulsion, aquarium water is certainly a worthwhile soil
amendment and can be used to water and feed outdoor plants. (The aroma may not be welcome
indoors if the water is used on houseplants.) If your compost pile needs a jolt, pour the
enriched water over the pile for a quick dose of natural fertilizer.