In short, usingaquariumwater to irrigate plants is a very good idea, with one major caveat. The major exception is water from a saltwater tank, which shouldn’t be used to waterplants; using salty water can do serious damage to your plants – especially potted indoor plants. Indoor Plants In Your Aquarium. Aquariumwater can be used to waterplants with a watering can, but it can also be used straight from the source. Many hobbyists have begun growing indoor plants, and even some fruits and vegetables, straight out of their aquariums. Aquariumwater is great forplants!! I've used it for years! There's also setups that are called aquaponics - you can google that for more information. If you get it right, the only addition needed is some type of natural fish food. The plants do all the filtering. fish in an aquarium Dirty fish tank water makes great plant food. Instead of pouring all those great nutrients down the drain use it to make your plants look great. an aquarium with waterforplants in it and the words usingaquariumwaterforplants. How To Treat AquariumWater. Only usewater from a healthy, thriving aquarium. If you’ve recently had a disease outbreak or are treating the tank with medications or algaecides, do not use that water on your plants. Wait until the tank is healthy and treatment is complete. Can You Water Houseplants with AquariumWater. Things to keep in Mind. UsingAquariumWaterforPlants.Avoid using fish tank waterfor house plants if you’ve added aquarium salt, any medication or chemical, including pH adjusters and algae killers. What do you think about usingaquariumwaterfor orchid watering? I have too many hobbies; they include both orchids and tropical fish. I have lots of tanks and do lots of water changes so the water is not getting salty. Is aquariumwater good for watering house plants. I keep my tank around 10ppm nitrogen.Basically watering your plants with aquariumwater is probably the best practice, better than using RO. Before you pour your aquariumwater down the sink, consider using it to water your plants. This not only saves water by recycling it, it saves you money on expensive fertilizers. Aquariumwater is a rich source of nitrogen, which is what plants need to make chlorophyll... I keep tropical fish and for all my time keeping plants (only a couple of years up to now), I have always usedaquariumwater to water my plants, along with some other feeds too. Any forum you go on and people gush over the benefits of aquariumwater as a top quality feed for your plants. While aquariumwater is beneficial for outdoor plants, it should be used in moderation. The water contains higher levels of nutrients than typical tap water, so overusing it may lead to an overdose of nutrients for your plants. You could useaquariumwaterfor several months and monitor how your plants respond. If they seem to thrive, great! If you plan to fertilize in addition to usingaquariumwater, you should use an organic fertilizer with a low NPK ratio. Organic fertilizers typically have low NPK values. 13. AquariumWater. 14. Boiled Vegetable, Pasta, or Rice Water. 15. Use Banana Peels as Fertilizer.You can use this ingredient forplants by adding 2 tablespoons to a medium-sized pot. It will help restore moisture and reduce the frequent watering requirements.