The Riverbed Mix Fish Tank Substrate by Oceanmax features 4-6mm natural-looking stones in a convenient 2kg bag. This substrate creates a gentle, authentic riverbed appearance in freshwater aquariums, making it a great fit for tanks of all sizes. Its varied textures and earthy colors encourage the growth of healthy bacteria, provide a stable base for plant roots, and create an enriching environment for fish to explore. Ideal as a versatile, all-rounder substrate, this riverbed mix fosters a healthy and visually balanced aquatic ecosystem, making maintenance easy and aquascaping effortless.