Arrived in cold weather, I was worried it wouldn't be active, but I didn't have to worry. This is a good product to populate a new aquarium with beneficial bacteria. 20 pounds was a substantial amount, about 14 inches long, 10 inches wide, and 2 inches thick. I assume the volume depends on the type of sand; large, loosely packed aragonite particles compared to small, tightly packed quartz particles.
Carib Sea ACS05820 Moonlight Aquarium
8 Review
5.7lb Black Small Decorative Pebbles - Versatile Gravel River Rock for Succulent Gardens, Home Decor, and Vase Fillers
8 Review
🪨 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
🐠 Enhance Your Aquatic Habitat with Pisces Midnight Pearl Aquarium Gravel!
9 Review
Efficient 2-In-1 Magnetic Fish Tank Cleaner With Non-Slip Design And Scratch-Free Blades
37 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
🐠 U-BCOO Aquarium Gravel Cleaner Fish Tank: Manual Siphon for Efficient Filter Gravel Cleaning and Water Change in Tanks
22 Review