What about that replica of Hogwarts Castle that took you weeks to complete? Legos can be perfect aquarium decorations, as long as you have the space. You can set up entire Lego scenes in the tank ...

To really immerse yourself in the underwater vibe, incorporate natural elements like rocks, coral pieces (artificial ones, ...

Ask any aquarium keeper, and they’ll tell you that their least favorite part about the hobby is cleaning their fish tanks.