medico wrote:
OP put back at the top where it belongs
"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.

Unless you're keeping marine or brackish water fish the water (and added
fish waste products) should do most plants good.

If your fish like alkaline water, then obviously don't give it to
lime-hating plants, but otherwise it should be fine.

When I had a tropical tank I always put the waste water on the garden
and never boticed any ill-effects.

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

Nonsense. The accumulated waste would kill the fish long before that,
even with good filtration.


Fresh tap water is harmful to fish.

Which is why you put dechlorinator in it, or let it stand for several
hours before adding it if you have a container big enough, as any
sensible fishkeeper knows.

--
Carol
"The glassblower's cat is bompstable"
- Dorothy L. Sayers, _Clouds of Witness_