Houseplant hacks: does fish tank water work as fertiliser?

Rather than pouring away old aquarium water, you could use it as free plant feed The problem Houseplants need liquid fertiliser, but this can be expensive. Fish tank owners, meanwhile, produce litres of nutrient-rich water during water changes, which then gets poured away. Could it feed houseplants instead? The hack Water from a freshwater aquarium contains nitrogen, phosphorus and beneficial bacteria. Rather than discarding it during routine water changes, use it to water your housepla...

By Gynelle Leon