And this is what your goldfish will eat:

pellets
bloodworms
daphnia
peas
broccoli
cucumber
orange slices
watermelon
raspberries
a gel made from squid and algae, in your microwave
an expensive grass plant that was supposed to cover the tank like a lawn
a moss ball that was supposed to live for several years and symbolize everlasting love
little bits of all of the above, picked out of the stones

And this is what it will mean to take care of someone:

the twice-daily feeding, the rush to the front,
the rubbery, muscular ecstasy at the sight of you,
the bringer of the food, the face through the glass.