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hydra



Hi all.
I'm new to the list and I am wondering how to deal with an outbreak of alien things in my planted tank, which I just recently found out are hydra. 
Any general info about what they are, what they eat, how to starve/kill/demoralize them, etc... would be great.  Or website links.  If this issue has already been talked to death, please feel free to contact me offlist.  
thanks!  
Bill     bpabst at asha_org