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I THINK I KNOW
Deep sea aquarium magmell?
https://www.mangago.zone/read-manga/deep_sea_aquarium_magmell/
Omg yess everyone!! I remember reading this and fell in love with the sea i got so sad back then it had very few chp ╰(*´︶`*)╯♡ love you guys for finding this thankyou thankyoy
Pls i read this when i was a kid its a deep sea aquarium like museum and the mc loves abt the sea so hes willing to work as a cleaner but then he gets the chance to work with the fishes