It is interesting that Drs Foster and Smith copied and pasted the info on the product from Ocean Nutrition, but changed the 5 weeks of use after opening to 7 days (am I missing something?). I wonder how this product can possibly keep its nutrition and exactly what Instar phase(s) we are talking about here. If the product does hold up it would be a great food for corals as well. Baby brine shrimp isn't really that difficult to culture and can be done quickly compared to other live food cultures. It is also helpful to have control of exact age and diet of the nauplii. However, I can see a real value in the product's convenience even still.