Aquarium Décor: what Claude and GPT would buy
Two AI models chose on their own, with no web access. Nobody tested these products: this is what each one says, and how to check it.
Claude and GPT choose the same brand, Zoo Med, but not the same product
In Pet Supplies, Claude and GPT choose the same brand in 20 of 49 categories.
Claude Opus 5.5 · October 28, 2026
Zoo Med Floating Betta Log (line)
A smooth-surfaced floating hide that gives bettas and other small surface-dwellers a shaded resting spot without sharp edges or loose paint.
Not for: Owners of large tanks or bottom-dwelling fish, who need sunken hardscape such as rock or wood instead.
GPT 6.1 Sol · November 10, 2026
Zoo Med Mopani Wood (line)
Natural hardwood creates attractive aquascapes, provides shelter, and typically sinks readily, making it a versatile freshwater aquarium centerpiece.
Not for: Keepers who want clear water without tannin staining or wood preparation.
Check before you buy
Where to find Zoo Med Floating Betta Log
- Chewy
- Petco
- PetSmart
Shops seen in search results on November 5, 2026. A shop missing here may sell it too. Nothing was checked by a person.
Brands that matter
- Zoo Med: Wide range of reptile and aquarium hides and natural wood.
- Penn-Plax: Large catalogue of resin ornaments, including licensed themes.
- Marina (Hagen): Mainstream artificial plants and décor.
- Tropica: Live plants grown and packed to a consistent standard.
- CaribSea: Substrates and dry rock, notably for reef tanks.
What to avoid
- Painted décor not made for aquarium use
- Seashells and limestone-type rock in soft-water tanks
- Collected outdoor wood or rocks that have not been identified and cleaned
- Ornaments with narrow holes that small fish can wedge into
Questions
Do I need to boil or soak new décor?
Rinse all décor in plain water without soap. Soak wood until it sinks and its tannins slow. Store-bought resin only needs a rinse.
Aquarium Marbles
Use glass marbles as a smooth, inert accent or in bare-bottom betta and breeding setups; plants can't root in them and food and waste settle between them. The décor rules above apply: aquarium-safe glass only and no painted coatings.