JBL Weekend was developed to provide adequate noutrishment for your aquarium fish during your weekend away from home. It contains all necessary constituents, like fish, grain, vegetable by-products, yeasts and algae in a balanced mixture. One JBL Weekend cube proportions automatically the food for 10-15 medium sized fish about 3 days long. The stones do not produce a water clouding. Depending on the water hardness, the cubes may dissolve quicker or slower.Do you have questions about this article ?