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I have also seen a cat sleeping on top of a fish tank. Provided the lid is secured I see no problem keeping fish and cats in the same household. If the fish are in a pond outdoors it would be wise to place wire mesh over the water. This will also prevent fish eating birds from taking them.
I think most cats take more notice of birds and small animals when they are hopping or running around. Fish might taste good to a cat but their movements are slower than the type of prey cats love to pounce on and play with.
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