Shipping beneficial bacteria is a fairy tale. There is only one company who ships bacteria for real, and they do it refrigerated and over night to many of the big aquariums and aqua parks in the us. Microbelift adds hydrogen sulfide to its product so that it seems real. Your best source of beneficial bacteria is to take filter muck from a friends filter and put it in yours. Sorry to be such a curmudgeon on this subject but That Info comes from hard research and interviews.