MagMell Shinkai Suizokukan

Deep Sea Aquarium MagMell (マグメル深海水族館; MagMell Shinkai Suizokukan) is a manga written and illustrated by Kiyomi Sugishita. It has been serialized in Go Go Bunch's magazine since April 8, 2017.

Plot
A tale about a modern deep-sea aquarium employee in Tokyo!What's living in the overwhelming darkness deep within the sea? Take a glimpse into this strange world about a boy working at a deep sea aquarium.

Other Sources

 * (MAL)