Welcome to the SereneScreen Aquarium Forum!
For future reference, this is the general discussion area for the Aquarium. We have a separate Aquarium forum just for
Mac OS 9 and Mac OS X where you can get help from other Mac users!
I'll try to answer your question though...
Please make sure that the file is named exactly "Marine Aquarium.saver". Also make sure that you are dragging the
screen saver version of the Aquarium to
/Library/Screen Savers/ and not the standalone
application version.
Please let us know if you have any further problems.