Place a piece of freeze dried brine shrimp into your aquarium and watch as the brine shrimp rehydrate almost instantly. Tropical fish of all types including discus love this food and it provides excellent roughage. A little goes a long way. If you normal feed 1 cube of freeze dried black worms at feeding time then I would recommend using 1/2 that amount of freeze dried brine shrimp. Free shipping to Canada and the USA! All other countries pay a flat $15 CAD.