If you're playing the free Flash (online) version, you won't be able to get all of the things in the game that would help you successfully breed all of the fragile hybrids (and most of the Magic Fish). That game is really intended to give you an idea of what Fish Tycoon is like, similar to a demo version. You can play the game for a long time, though, if you breed only the common species of fish, since they will thrive in the Fish Environment that's available in that version of the game. Some of the common fish sell for decent prices, and you can make pretty good money that way.