Safe & Non-Toxic {Small Size, 0.3” Inch} 30 Pound Bag of Gravel & Pebbles Decor for Freshwater & Saltwater Aquarium w/ Dark Earthy Tones Forest River Style [Brown, Tan, Green, Red & Yellow]

SIZE OF SUBSTRATE: Substrates vary widely in terms of size - everything from sands consisting of very tiny particles to larger river rocks. Large particle substrates allow more uneaten food and waste to penetrate into it leading to toxic build ups...