Review on CaribSea Arag Alive Special Grade 20 Pound by April Irvin

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.