Why O Why are you depriving the fish of their water??
A good fish keeper wouldn't change any water in two years.

Fresh tap water is harmful to fish.


"Ford Prefect" wrote in message
...
I keep a couple of tropical fish tanks and was wondering if the waste
water after water changes would be benificial or harmful to garden
plants, seems a shame to flush 40l a week if it could be doing some
good in the garden instead.
Cheers,
Ford.