I love guides like this for some reason. There's something intriguing about material written from the "What if they actually existed?" angle, taking on things like the practical considerations of yukkuri as pets, livestock, etc. I guess the advisory or documentary style of some of these kinds of things just helps the feeling of realism.
For the Shell Marisa, we can consider both kinds of aquaria mentioned above. The water level should be within the range for Hatted Marisa and Nitori; places with moist sand should be secured for the shelled ones to survive.Stability of the aquarium is the primary consideration for the Hatted Marisa; choose a cuboid aquarium with a large base.
There should be platforms on the water surface, serving a place for the yukkuri to eat and excrete.
The water should not be too deep; twice the height of their hats is sufficient.Now you have to choose the aquarium. This depends on the adaptability of the three types toward aquatic lives. Arranged in ascending order of their tolerance toward aquatic environments, they're Hatted Marisa, Shell Marisa and Nitori. Based on this, the choice of suitable aquariums is shown below:To accommodate Yukkuri Nitori, which prefer deepwater environments, one should employ a deep aquarium with a large volume. With the aquatic environment completed with sand piles, seaweeds and segments of wood, one could energize the active, playful Nitori.
As Nitori can hide itself with camouflage, an aquarium with a wide base should be avoided.