Purchase All Fish
You buy an aquarium, set it up nice and look to buy some fish. That's when you realise that the fish you really want is not available to buy.
Be sad no longer, this mod will allow you to purchase any fish from any fishbowl or aquarium so find your favourite and enjoy having a fishy friend.
Important: There is a game error that triggers when you place any fish in a fishbowl. It is safe to ignore, but if it bothers you, you can use the 'bandaid' mod fix by NeedsCoffee4That available here.
This mod requires XML Injector by Scumbumbo. You only need ONE copy of it.
Credit to:
As always, Lot 51 and the Sims 4 Studio team for the modding tools.
The late Scumbumbo for the XML Injector