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I never had fish at the same time as having a cat, but if the lid is securely fastened then I think it would work out alright. I have seen my friend's cat sitting in front of his big fresh water tank completely amazed at the sight of fish. She sits and watches the fish swim from one side of the tank to the other. Often she will stare at the snails climbing up the glass and totally lose track of time. It is entertaining to watch the cat and the fish.
It reminds me of people who play videos of aquariums for their pets to watch when they are not at home. I have seen cats trying to catch the fish on tv, and even climbing on top of the tv thinking they will catch the fish from the top. Cats can be very funny and might try to catch fish in a tank if given the chance to do so when no one is looking.
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