Cops found a shark-infested pool with a Christmas tree centrepiece while responding to reports of a disturbance.
Sussex Police said they were called to the ground-floor flat in Haywards Heath on Friday and were shocked to find the bizarre makeshift 8ft aquarium in the front room.
It had an artificial Christmas tree in the middle which the snapping fish were paddling around.
It is unknown if the predatory pets, who the owners had no real reason for having, were the cause of the disturbance.
Police will be speaking to the housing association to see if the tenancy agreement allows the toothy tenants.
Mid Sussex Neighbourhood Policing Inspector Darren Taylor, of Sussex Police, was shark-ed to hear what his team found.
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He wrote on Twitter: "Just when you think you have heard it all! Team attended a premises over the weekend, only to discover a 8ft swimming pool in the front room.
"In the swimming pool (apart from water) were small sharks swimming around and an artificial Christmas tree in the middle! I kid you not!"
One of his social media followers replied: "We're gonna need a bigger bauble," in reference to the iconic line from 1975 film Jaws.
John Lawrence said: "I bet their "Jaws" dropped when they saw that."
Another follower, named Ann, replied: "Was there any people there or were they breakfast.
Deanna Pennington commented: "Please tell me someone started up the chorus for Baby Shark."
