Pirate Theme
Sunken ship, treasure chest, pirate skull. Great for goldfish, small tropical fish.
Ensure all pieces are aquarium-safe. Avoid real metal from unknown sources.
Castle Theme
Gothic castle, cave fortress. Perfect for cichlids (natural territorial elements).
Ensure entrances are wide enough for your fish. Trapped fish is a disaster.
Space Theme
Glow-in-dark gravel, alien figurines, UFO ornaments. Fun for kids.
Verify glow materials are aquarium-safe. Some fluorescent paints leak toxins.
Fish Welfare First
Always 30% minimum open swimming space. Don't overcrowd with decor.
Check for sharp edges, trapped spaces, and unstable stacking.