Virtual Villagers Tips & Tricks, Walkthroughs, Guides, Hints and HelpLast Day of Work Official Forums: Virtual Families, Virtual Villagers, Fish Tycoon
I reckon it gives you something you'll almost certainly already have. If, say, it allows L3 fish to live in a L2 environment, you probably have L3 already as without it you wouldn't be able to afford the price of the seahorse.
_________________________ To err is human; to arr is pirate.