Hi Peter,
Well good luck with the extention to your house and further more than with the development of your project.
You asked where abouts ont eh planet i am? Well I am in Johannesburg - South Africa. Where do you stay?
I tend to agree with your comment about an ecosystem being selfsustaining, and at the same time the other arguments about startign the whole thing off witha bit of help also seems true. The way i approach this concept (and correct me if i'm wrong), is that it is like a giant puzzle. There are plenty pieces, infact to try and incorporate all of them in the begining will be depressing. The way i see it is one starts it off, like you say perhaps with a few plants and then as the various balances are reached, so the next piece of the puzzle can be added. I believe that the secret is patience and time. In attempting to create a natural ecosystem in a closed / controlled environment is a matter of trial and error to a large extent. I think it is something that can be played with and like i said the fun is in adding the next piece of the puzzle once the balance fromt eh existing pieces has been established.
Qwikimpss and opcn chat about refugiums, this is a great idea. Do you guys already use this method of feeding/brooding and if so what is your main drive behind chooseing this method to regular feeding with flakes etc?