Where can I find hydra microorganisms?

Excuse me, I was wondering if you could possibly assist me with a query. I'm trying to locate a source for hydra microorganisms and I'm not quite sure where to start. Could you perhaps direct me to some resources or suggest some places where I might be able to find them? It would be greatly appreciated if you could offer any insights or advice on this matter. Thank you very much in advance for your time and assistance.