Haven't checked out that site hun but i have had a look at aquariumlife - seems to have some ok info there.
No filter in his little tank but i would be putting in his rocks & his plant and can tip some of his water?

I keep thinking i should have put our goldies into the little tank and him straight into the bigger tank on his own until we get the new tank.. feel so horrible for him being in the tiny tank all alone with no space.