Sorry, I didn't know that about goldfish. I would put an oscar in there. Those little things are sooo cute.
oscars are not "little things"...not for long at least. they get even bigger than goldfish, and a full-grown oscar could be cramped even in a 55 gallon tank.
So remember, when you're feeling very small and insecure,
How amazingly unlikely is your birth,
And pray that there's intelligent life somewhere up in space,
'Cause there's bugger-all down here on Earth.
Loki/Grendel/Gail/Beowulf/Camilla/River/Bathory/Arwen/Lafayette/Deb/Jack Skellington (soon)