confused about the fish tank bundles

[estudiomucho]

The specialty fish bundle requires a sandfish, and according to the wiki, it can only be caught in the desert. But I can't go to the desert without finishing the bundles first. I'm really confused. If I don't have the sandfish I can't finish the bundles and unlock the desert, but if I can't go to the desert I can't catch a sandfish.
How is this supposed to work? I'm still pretty new to this game so I'd really appreciate it if anyone can help me out a little

[Kona❤Kona]

The Vault Bundle unlocks the bus to the desert, not every bundle.

[Keeper Of Monsters]

You only need to finish ANY 4 bundles to unlock Vault room - and then only need money to finish Vault and repair the bus. After that - you can go to the desert.
First finished bundle - unlock Pantry and Fish Tank (and you already got it).
2nd - unlocks Boiler room.
3rd - Bulletin board.
And then one more for the Vault.
And for any of those it can be any bundle, any at all, from any room - just pick whatever you can complete faster.

[poppetshadow]

^ what they said, but also check the traveling cart in the forest on fridays and sundays. The sandfish is usually available for sale at least once a year.