These are small smooth black stones. One star off because my hands turn black when I touch them. They are perfectly clean, it seems that they come from the stones themselves.
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
π¬ Stylish and Durable Black Mesh Desktop Letter Sorter - Perfect for Organizing Letters on your Desk
8 Review
Carib Sea ACS05820 Moonlight Aquarium
8 Review
π Enhance Your Aquatic Habitat with Pisces Midnight Pearl Aquarium Gravel!
9 Review
Steam cleaner Deerma Deerma DEM-ZQ610 EU, white/red
68 Review
Vacuum cleaner TEQQO Aquastick 3 in 1 Power, grey/turquoise
26 Review
Jasonwell Magnetic Aquarium Fish Tank Glass Algae Cleaner - Floating Brush (L Size)
37 Review
Greenpro Micranthemum Monte Carlo: Live Large Pearl Grass Aquatic Plant In Tissue Culture Cup For Freshwater Fish Tanks And Aquariums
49 Review