Article: Slugs generally do well in aquariums. An aquarium should be at least 20 centimeters by 20 centimeters (8 by 8 inches). You can buy an aquarium online or at a pet store.  Make sure to provide proper ventilation. The lid should have holes for ventilation. Something like a mesh lid, for example, would work well. Slugs are very small, especially in comparison to reptiles that are usually kept in aquariums. Examine ventilation holes carefully and make sure a slug cannot creep out of these holes. It's best to use soil, grass, and leaves from outdoors for the substrate. If you took the slug from outdoors, use soil, leaves, and grass from the area where you found it. Make sure to sift through soil before adding it to your aquarium to remove any bugs. Once a week, remove your slug and put it in a safe container with air holes. Remove the substrate and then replace it. Slugs may benefit from certain aquarium supplies such as fake plants and leaves. You can also bring in real material from outside, such as twigs, for slugs to climb on. If you bring anything in from outside, make sure to inspect it carefully before putting it in your slug's tank. Slugs prefer temperatures between 60–70 °F (16–21 °C). Put a humidifier next to their aquarium to keep them hydrated. If the aquarium is too hot or cold, the slug will bury itself and produce more mucous. If it is not humid enough, the slug will dry out.
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Find the right container. Provide substrate. Invest in aquarium supplies. Keep the room cool and humid.