The next time you do a water change, think twice before dumping that old tank water down the drain! Using aquarium water for your terrestrial houseplants is one of the best eco-friendly hacks in the hobby.
Why Houseplants Love It Aquarium water is essentially a mild, natural liquid fertilizer. It is loaded with nitrates, phosphorus, potassium, and trace minerals derived from fish waste, uneaten food, and decaying plant matter. Furthermore, the beneficial bacteria present in the tank water can help promote a highly active, healthy soil microbiome in your potted plants.
When NOT to Use It There are a few exceptions. You should not use aquarium water if you are currently treating your tank with medications, chemical algaecides, or aquarium salt. Salt buildup in potting soil is highly toxic to most terrestrial plants. Additionally, if your tank is currently experiencing a severe bacterial disease outbreak, it is generally safer to discard the water.
Otherwise, your Monsteras, Pothos, and Philodendrons will thrive on this nutrient-rich “dirty” water. It’s a fantastic way to conserve water while giving your indoor jungle a free nutritional boost.
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