Try looking for Home Brew stores, or maybe even some larger liquor stores. They might refill tanks for peoples home kegerators. Those should have food grade, so no worries about killing your shrimp.
mmm. good tip.
Try looking for Home Brew stores, or maybe even some larger liquor stores. They might refill tanks for peoples home kegerators. Those should have food grade, so no worries about killing your shrimp.