Most are, but it's worth checking for sharp edges or narrow gaps if you keep long-finned fish like Betta, as fins can snag or tear. Smooth, rounded ornaments are the safer choice for those tanks.

Yes, give them a rinse in plain water first to remove any dust or manufacturing residue. Don't use soap or cleaning products, as any residue left behind can harm your fish.

Most resin and ceramic ornaments are inert and won't change your water parameters. Natural items like certain rocks can affect hardness or pH, so it's worth checking before adding anything you haven't sourced from us.

Yes, just think about placement so they don't block light to your plants or crowd out root space as everything grows in.