Aquarium Lava Rock, Rare Multi Color Lava Porous Moss and Plant Friendly 10 stones Multi Color Lava 100% All Natural. Plant and Moss Friendly Offer your aquatic pets a more natural habitat. Perfect home for fish and many other sea creatures Safe for All Water Types, Stones are approx 7 inches - 2 inches long Aquascapes approx 10-20 focal point area!