I was watching two of our cats this morning drink out of the fish tank on the table in our dining room. Our one cat Felix is a beautiful black/grey/white tummy tabby. Our fish tank has two fish, a filter that runs and he likes to drink from the top of the tank where the water bubbles up. He doesn't bother the fish or even seem interested in them. The same is true of our black cat Scratchy.
They are both about a year old. That water sure must taste good!