I don't know what it is or how safe it is but there is something black on these stones. I've cooked it twice and still a small amount of film comes off leaving a black coating on the pan and hands. I'm nervous about using them for my tank until I know they're 100% clean and not easy to clean.
Carib Sea ACS05820 Moonlight Aquarium
8 Review
πͺ¨ CJGQ Black Pebbles for Plants 7lb - Bulk Bag of Aquarium Gravel 1-1.5 inch - Decorative Polished Stone for Fish Tanks - River Rocks
9 Review
Versatile Medium White Pebbles - Perfect for Plants, Fish Tanks, Vases, Sidewalks, Aquariums, Terrariums, and More!
8 Review
π Enhance Your Aquatic Habitat with Pisces Midnight Pearl Aquarium Gravel!
9 Review
Greenpro Micranthemum Monte Carlo: Live Large Pearl Grass Aquatic Plant In Tissue Culture Cup For Freshwater Fish Tanks And Aquariums
49 Review
Mini pump Xiaomi Mijia Electric Pump 1S, plastic, black
55 Review
Jasonwell Magnetic Aquarium Fish Tank Glass Algae Cleaner - Floating Brush (L Size)
37 Review
Steam cleaner Deerma Deerma DEM-ZQ610 EU, white/red
68 Review