Are aquarium decorations safe for fish?

Across specialist communities like r/Aquariums, the recurring consensus is that decor is fine as long as it's genuinely aquarium-safe: inert stone, untreated hardwood driftwood, and aquarium-grade resin or silk plants. Reviewers flag painted novelty ornaments as the main risk because paint can bubble and peel over time, and warn against random plastic that smells or feels slimy in water. Live plants and ceramic caves draw the fewest safety complaints.