With 5 Tangs in house longevity of the product is not high on my worry list, lol!
Wow! They must eat the equivalent of a large dinner salad daily lol. I've found that the "Ocean Nutrition Seaweed Selects" were always old and/or stale when I bought them b/c of that crappy plastic box they use for packaging. It also breaks up easily and creates more of a mess. In comparison the Sea Veggies have a much more potent/fresh smell and color, I assume one reason is b/c of better packaging practices, and it stays together even when fish are tearing into it. BTW
"Julian Sprung's Sea Veggies" are marketed for herbivorous fish, not human consumption. You won't find it at the oriental grocer-at least not in the original packaging j/k