I'd suggest a fire eel - we had one that lasted for years, we used to feed it earthworms from the garden. It got on with the other fish but anything small and he ate it.
In my dreams yes, they are from the shed aquarium however, and every species pictured would be suitable for a 6X2X2, not all of them in the same tank mind you, but they are quite stunning indead.
my dad says that he whants it to be colourful and i have to be able to get hold of them any surgestions
i am not getting sw because my tank is not set up for them
It doesnt take that much to change to a FO system, new sand, a 12 dollar pack of biospira, adequit filtration and a 50 lb bag of salt and you are there. Then you can slowly acrue liverock through buying a little each week for the next 6 months or so.