All aquariums need gravel or substrate for a healthy tank, gravel provides a home for good bacteria and encourages it to grow. Gravel is also better than sand in a fish tank as water can pass easily through. The smooth, round shape won�t injure or harm fish and plants can be easily inserted, it is vital to preserve the biological balance of your aquarium. Keep your tank beautiful, clean and pleasing to the eye with these carara round stones made from high quality components. || * Aquarium substrate | * Fish tank gravel | * High quality components | * Health bacteria grows | * Won�t harm fish
