OASE ScaperLine SoilAquascape Substrate OASE ScaperLine Soil is an active substrate for planted aquariums. Using this soil as a base in your aquascape will facilitate the best possible plant growth. Active Soil The active soil makes the water softer and creates a slightly acidic pH range that is favorable for many aquarium plants. The values may vary depending on the fish species being kept. Nutrient Storage Active soil can both absorb and release nutrients from the