Of course you have to feed them. (They are tropical fish so should not be in a cold water tank with goldfish anyway). Your suckerfish are algae eaters and need their own special diet that's available at pet shops.
feed them boiled peas without the shell (just the mushy bit inside) .
Ectoparasites feed on a living host from inside of it. eg. bacteria, virus's
you can feed them peas or zucchini
You should not feed goldfish soup.
When I feed my goldfish they act excited.
feed them lead feed them lead feed them lead
I feed mine goldfish flakes
umm... no
I feed mine goldfish flakes and they eat it.
it really doesnt matter as long as you try to feed the goldfish around the same time every day.
Maybe or maybe not...
kittens c: