WEEKEND FOOD multi-ingredient sinking tablets for ornamental fish. Their formula ensures excellent condition of fish and does not deteriorate the quality of water. WEEKEND FOOD tablets do not easily disintegrate in water. When placed in the tank, they soften very slowly, encouraging fish and shrimps to feed. Can also be used in nano-aquaria. They will last for up to 10 days. CAUTION! Use only in stable and mature tanks.