I do not wish to malign Celebane's Fish Tracker, however I found I could not use it for myself. For one thing I wanted to not only track the fish, but their fry, their values and make sure I didn't breed the same two pairs together more than once. I have been playing the game only a week but I am so enthralled in it that I can't stop. only problem is I breed over 40 pairs a day (real life day) and it quickly became a problem keeping track of which fish got lucky with which fish. I am working out of Access 97 and have set up a number of tables that works for me. Now for the big problem. After only a few short days I either print out huge reports daily or I have to find a way for the database to warn me when a potential pairing I'm doing is a duplication or original. I have bashed my brain into the keyboard so many times now that it's got a permanent fghj tattoo on my forehead. Hopefully there are a few other fishy type characters out there that are well versed in access 97 or a close relative that can give me clues as to how I may set it up to do what I want. If so, msg me, email me, or post it here. when I am done I will offer up my humble contribution alongside Celebanes and give you all a choice of databases.

use mysql - you will have a much better database experience.
You gonna put it on the web?

set up keys on two columns of your table..
Example if your table has Fish1 and Fish2 you can set keys up on both columns Fish1 and Fish2 by doing that it will not allow duplicates of that specific combination.

Let me know if you have any other problems....

that would be a huge waste of the money I poored out for access, yes I actually bought and paid for a MS office product. your suggestion almost works, however, columns fish1 and fish2 can have duplicates out the ying yang, where I don't want duplicates are fish1 AND fish2... that way I only breed my greenfin beta to 440 other fish and don't let her sleep with the same fish twice.