This fresh frozen, well-cleaned natural food item is an excellent and popular food source for your fish. Our tubifex is harvested at an early stage resulting in small, healthy and nutritious worms. Instructions for use: push out the required amount of cubes into a recipient. Let them defrost, without water, at room temperature during minimum 10 to 15 minutes before feeding. Frozen foods may defrost in transit, please return to the freezer as soon as possible upon delivery. Ingredients Tubifex worms.