We have an orange fish in the fish tank in the living room.
Pronunciation: teh-NEH-mos oon PES nah-RAHN-hah en lah peh-SEH-rah deh lah SAH-lah
Grammar: Pez is a masculine noun meaning a live fish (in water). Use 'un' as the indefinite article; adjectives like 'naranja' usually follow the noun.