Twinkles wrote:

Hi,

At the moment I've been keeping one goldfish, but I was wondering how
big a tank should be, in terms of surface area and litres, to keep more
fish.

Is there some sort of equation to go by?

Thanks!

Twinkles.

And also, if I put in some oxygen weed, how much should there be? (does
it take something away from the water?)


Twinkles,

You need about 10 gallons per fish. This is about 40litres or so. The
surface area should be quite big (rather than having less surface area
and a deeper tank). As far as oxygen, I use airstones or a powerful filter
to ripple the water - this, as I am told, gives good air exchange.