Each shell block will  feed 3-4 days in a 10-15 gallon tank.

Simply place the week-end block into your aquarium and within hours it will start to dissolve, releasing nutritious freeze dried foods, while also neutralizing your aquarium water.

Ingredients: calcium sulfate, freeze dried tubifex, freeze dried bloodworm, freeze dried daphnia, freeze dried shrimp, vitamins B-1 & B-6.