I just found these and had a good laugh about how lame they were! Enjoy xD I'm planning on one day eventually revamping these into a proper big aquarium/gym map.
The first room is a penguinarium, inspired by the world's biggest (and only) penguinarium in my home town in tenerife. It was gonna have piplup, prinplup and empoloeon. (maybe delibird) The second was just a general small sea life. The third was ocean depths themed. The fourth was arctic themed, with seel, dewgong, spheal, sealeo, walrein, swinub, piloswine, lapras. Obviously with newer pokemon they'd be in there if I did it now like vannilite, etc.