If you are not from the USA:
To get the Fish tank:
2. Log into Stardoll.
3. You should have the fish tank in your suite!
To get the shirt you'll need to watch a clip in the Stardoll Cinema. This doesn't work with a proxy server, so you'll need to use a manual proxy if you really want it.
Link to the clip: http://www.stardoll.com/en/cinema/?id=181