I have three other fish tanks - a 240l South American themed tank - tetras, corys, bristlenoses, a 48 litre tank with shrimp, snails and guppies. The third tank is a 28litre tank where I raise the guppy and bristlenose fry.
My wife likes furrier pets and had three gunea pigs.
We also have a cat although it adopted us and came to live with us.