Petco cultures have worked for me, but I mostly use them just in a pinch, or if I want to start up a new set of cultures. It's too expensive to ship the cultures most of the time, so I buy the medium seperately (it's dry goods and can go normal ground shipping) and then get my starter culture from the pet store. BTW, Petsmart sells D. hydei, so my hydei cultures orginally came from there.
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