Hey Vimes,

The general rule of thumb is not to feed your fish anymore food than
they'll eat in 5 minutes and to remove any leftover food from the
water.

I have never really adhered to these rules! I generally don't feed my
fish anymore food than they will consume in 2 minutes.

Feed very small amounts - what they will eat in 2 minutes is a good rule of
thumb - for people who have a tendency to overfeed- which is most of us - be
deliberate - to feed less.