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closed ecosystem??

>Date: Mon, 16 Mar 1998 21:53:23 -0800
>From: Rice <ucmagguy at inetworld_net>
>Subject: self-contained ecosystem
>        I few years back, I went to a local amusement park (Sea World) and
saw a
>neat little ecosystem they have inside a little glass sphere for sale.
They had
>a few red salt water shrimps,  some gravel and a small piece of coral
>sealed inside a glass sphere. 

Am I wrong in thinking that this would be impossible. Surely the sphere
could not be completely enclosed. The living things would need air. 

in Vancouver